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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1306.4927 | Li-Ming Cao | Rong-Gen Cai and Li-Ming Cao | Generalized Formalism in Gauge-Invariant Gravitational Perturbations | review tex, 35 pages, no figure | Phys. Rev. D 88, 084047 (2013) | 10.1103/PhysRevD.88.084047 | ICTS-USTC-13-13 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By use of the gauge-invariant variables proposed by Kodama and Ishibashi, we
obtain the most general perturbation equations in the $(m+n)$-dimensional
spacetime with a warped product metric. These equations do not depend on the
spectral expansions of the Laplace-type operators on the $n$-dimensional
Einstein manifold... | [
{
"created": "Thu, 20 Jun 2013 16:09:46 GMT",
"version": "v1"
}
] | 2013-11-13 | [
[
"Cai",
"Rong-Gen",
""
],
[
"Cao",
"Li-Ming",
""
]
] | By use of the gauge-invariant variables proposed by Kodama and Ishibashi, we obtain the most general perturbation equations in the $(m+n)$-dimensional spacetime with a warped product metric. These equations do not depend on the spectral expansions of the Laplace-type operators on the $n$-dimensional Einstein manifold. ... |
gr-qc/9907045 | Teviet Creighton | Teviet Creighton (California Institute of Technology) | Gravitational waves and the cosmological equation of state | 5 pages REVTeX, 3 figures | null | null | GRP-517 | gr-qc | null | Primordial gravitational waves are amplified during eras when their
wavelengths are pushed outside the cosmological horizon. This occurs in both
inflationary and ``pre-big-bang'' or ``bounce'' cosmologies. The spectrum is
expressed as a normalized energy density per unit logarithmic frequency,
denoted Omega. The spec... | [
{
"created": "Mon, 12 Jul 1999 21:00:54 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Jul 1999 23:07:02 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Creighton",
"Teviet",
"",
"California Institute of Technology"
]
] | Primordial gravitational waves are amplified during eras when their wavelengths are pushed outside the cosmological horizon. This occurs in both inflationary and ``pre-big-bang'' or ``bounce'' cosmologies. The spectrum is expressed as a normalized energy density per unit logarithmic frequency, denoted Omega. The spectr... |
1604.06051 | Peter Millington | Clare Burrage, Edmund J. Copeland, Peter Millington | Radiative Screening of Fifth Forces | 6 pages, 2 figures, revtex format; to match published version:
discussion of first-order thermal phase transitions included, additional
constraints taken into account and references expanded | Phys. Rev. Lett. 117, 211102 (2016) | 10.1103/PhysRevLett.117.211102 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe a symmetron model in which the screening of fifth forces arises
at the one-loop level through the Coleman-Weinberg mechanism of spontaneous
symmetry breaking. We show that such a theory can avoid current constraints on
the existence of fifth forces but still has the potential to give rise to
observable de... | [
{
"created": "Wed, 20 Apr 2016 18:21:12 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Nov 2016 18:05:52 GMT",
"version": "v2"
}
] | 2016-11-17 | [
[
"Burrage",
"Clare",
""
],
[
"Copeland",
"Edmund J.",
""
],
[
"Millington",
"Peter",
""
]
] | We describe a symmetron model in which the screening of fifth forces arises at the one-loop level through the Coleman-Weinberg mechanism of spontaneous symmetry breaking. We show that such a theory can avoid current constraints on the existence of fifth forces but still has the potential to give rise to observable devi... |
1707.01235 | Jie-Xiong Mo | Jie-Xiong Mo, Gu-Qiang Li | Holographic Heat engine within the framework of massive gravity | 9pages,4figures | null | 10.1007/JHEP05(2018)122 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Heat engine models are constructed within the framework of massive gravity in
this paper. For the four-dimensional charged black holes in massive gravity, it
is shown that the heat engines have a higher efficiency for the cases $m^2>0$
than for the case $m=0$ when $c_1<0, c_2<0$. Considering a specific example, we
sh... | [
{
"created": "Wed, 5 Jul 2017 07:11:56 GMT",
"version": "v1"
}
] | 2018-06-13 | [
[
"Mo",
"Jie-Xiong",
""
],
[
"Li",
"Gu-Qiang",
""
]
] | Heat engine models are constructed within the framework of massive gravity in this paper. For the four-dimensional charged black holes in massive gravity, it is shown that the heat engines have a higher efficiency for the cases $m^2>0$ than for the case $m=0$ when $c_1<0, c_2<0$. Considering a specific example, we show... |
1312.1723 | Marco Astorino | Marco Astorino | Pair Creation of Rotating Black Holes | 13 pages, v2: typos corrected and reference added | Phys. Rev. D 89, 044022 (2014) | 10.1103/PhysRevD.89.044022 | CECS-PHY-13/10 | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An exact and regular solution, describing a couple of charged and spinning
black holes, is generated in an external electromagnetic field, via Ernst
technique, in Einstein-Maxwell gravity. A wormhole instantonic solution
interpolating between the two black holes is constructed to discuss, at the
semi-classical level,... | [
{
"created": "Thu, 5 Dec 2013 22:36:44 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Feb 2014 21:18:22 GMT",
"version": "v2"
}
] | 2014-02-28 | [
[
"Astorino",
"Marco",
""
]
] | An exact and regular solution, describing a couple of charged and spinning black holes, is generated in an external electromagnetic field, via Ernst technique, in Einstein-Maxwell gravity. A wormhole instantonic solution interpolating between the two black holes is constructed to discuss, at the semi-classical level, t... |
1905.13237 | Zachary Nasipak | Zachary Nasipak, Thomas Osburn, Charles R. Evans | Repeated faint quasinormal bursts in extreme-mass-ratio inspiral
waveforms: Evidence from frequency-domain scalar self-force calculations on
generic Kerr orbits | 28 pages, 11 figures, 5 tables; Updated to reflect published version | Phys. Rev. D 100, 064008 (2019) | 10.1103/PhysRevD.100.064008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report development of a code to calculate the scalar self-force on a
scalar-charged particle moving on generic bound orbits in the Kerr spacetime.
The scalar self-force model allows rapid development of computational
techniques relevant to generic gravitational extreme-mass-ratio inspirals
(EMRIs). Our frequency-d... | [
{
"created": "Thu, 30 May 2019 18:00:17 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Sep 2019 16:42:29 GMT",
"version": "v2"
}
] | 2019-09-17 | [
[
"Nasipak",
"Zachary",
""
],
[
"Osburn",
"Thomas",
""
],
[
"Evans",
"Charles R.",
""
]
] | We report development of a code to calculate the scalar self-force on a scalar-charged particle moving on generic bound orbits in the Kerr spacetime. The scalar self-force model allows rapid development of computational techniques relevant to generic gravitational extreme-mass-ratio inspirals (EMRIs). Our frequency-dom... |
2201.08390 | Abhik Kumar Sanyal Dr. | Manas Chakrabortty, Kaushik Sarkar and Abhik Kumar Sanyal | The issue of Branched Hamiltonian in F(T) Teleparallel Gravity | 12 pages, 0 figures | International Journal of Modern Physics D, (2022) 2250083 (14
pages) (2022) | 10.1142/S0218271822500833 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As in the case of Lanczos-Lovelock gravity, the main advantage of F(T)
gravity is said to be that it leads to second order field equations, while F(R)
gravity theory leads to fourth order equations. We show that it is rather a
disadvantage, since it leads to the unresolved issue of `Branched Hamiltonian'.
The problem... | [
{
"created": "Thu, 20 Jan 2022 15:15:23 GMT",
"version": "v1"
},
{
"created": "Sat, 25 Jun 2022 03:29:35 GMT",
"version": "v2"
}
] | 2022-06-28 | [
[
"Chakrabortty",
"Manas",
""
],
[
"Sarkar",
"Kaushik",
""
],
[
"Sanyal",
"Abhik Kumar",
""
]
] | As in the case of Lanczos-Lovelock gravity, the main advantage of F(T) gravity is said to be that it leads to second order field equations, while F(R) gravity theory leads to fourth order equations. We show that it is rather a disadvantage, since it leads to the unresolved issue of `Branched Hamiltonian'. The problem i... |
1404.2236 | Matthew Williams Ph.D. | C.P. Burgess and M. Williams | Who You Gonna Call? Runaway Ghosts, Higher Derivatives and
Time-Dependence in EFTs | 12 pages | JHEP 1408 (2014) 074 | 10.1007/JHEP08(2014)074 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We briefly review the formulation of effective field theories (EFTs) in
time-dependent situations, with particular attention paid to their domain of
validity. Our main interest is the extent to which solutions of the EFT capture
the dynamics of the full theory. For a simple model we show by explicit
calculation that ... | [
{
"created": "Tue, 8 Apr 2014 17:56:43 GMT",
"version": "v1"
}
] | 2014-09-02 | [
[
"Burgess",
"C. P.",
""
],
[
"Williams",
"M.",
""
]
] | We briefly review the formulation of effective field theories (EFTs) in time-dependent situations, with particular attention paid to their domain of validity. Our main interest is the extent to which solutions of the EFT capture the dynamics of the full theory. For a simple model we show by explicit calculation that th... |
1211.0426 | Francisco Lobo | Francisco S. N. Lobo, Tiberiu Harko | Extended f(R,L_m) theories of gravity | 3 pages; contribution to the proceedings of the Thirteenth Marcel
Grossmann Meeting, Stockholm University, Sweden, 1-7 July, 2012 | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a maximal extension of the Hilbert-Einstein action and analyze
several interesting features of the theory. More specifically, the motion is
non-geodesic and takes place in the presence of an extra force. These models
could lead to some major differences, as compared to the predictions of General
Relativit... | [
{
"created": "Fri, 2 Nov 2012 11:42:03 GMT",
"version": "v1"
}
] | 2012-11-05 | [
[
"Lobo",
"Francisco S. N.",
""
],
[
"Harko",
"Tiberiu",
""
]
] | We consider a maximal extension of the Hilbert-Einstein action and analyze several interesting features of the theory. More specifically, the motion is non-geodesic and takes place in the presence of an extra force. These models could lead to some major differences, as compared to the predictions of General Relativity ... |
gr-qc/0402007 | Gilles Esposito-Farese | Gilles Esposito-Farese | Binary-pulsar tests of strong-field gravity and gravitational radiation
damping | 20 pages, LaTeX 2e, 7 postscript figures, contribution to 10th Marcel
Grossmann Meeting, 20-26 July 2003, Rio de Janeiro, Brazil | null | 10.1142/9789812704030_0039 | null | gr-qc astro-ph | null | This talk reviews the constraints imposed by binary-pulsar data on gravity
theories, focusing on ``tensor-scalar'' ones which are the best motivated
alternatives to general relativity. We recall that binary-pulsar tests are
qualitatively different from solar-system experiments, because of
nonperturbative strong-field... | [
{
"created": "Mon, 2 Feb 2004 13:53:33 GMT",
"version": "v1"
}
] | 2016-11-09 | [
[
"Esposito-Farese",
"Gilles",
""
]
] | This talk reviews the constraints imposed by binary-pulsar data on gravity theories, focusing on ``tensor-scalar'' ones which are the best motivated alternatives to general relativity. We recall that binary-pulsar tests are qualitatively different from solar-system experiments, because of nonperturbative strong-field e... |
2303.13783 | Rikpratik Sengupta | Rikpratik Sengupta, Shounak Ghosh, B C Paul, Mehedi Kalam | Lorentzian wormholes in an emergent universe | 13 pages, 3 figures | Class. Quantum Grav. 40 (2023) 095009 | 10.1088/1361-6382/acc5d7 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | A non-singular Emergent Universe (EU) scenario within the realm of standard
Relativistic physics requires a generalization of the Equation of State (EoS)
connecting the pressure and energy density. This generalized EoS is capable of
describing a composition of exotic matter, dark energy and cosmological dust
matter. ... | [
{
"created": "Fri, 24 Mar 2023 03:49:54 GMT",
"version": "v1"
}
] | 2023-04-10 | [
[
"Sengupta",
"Rikpratik",
""
],
[
"Ghosh",
"Shounak",
""
],
[
"Paul",
"B C",
""
],
[
"Kalam",
"Mehedi",
""
]
] | A non-singular Emergent Universe (EU) scenario within the realm of standard Relativistic physics requires a generalization of the Equation of State (EoS) connecting the pressure and energy density. This generalized EoS is capable of describing a composition of exotic matter, dark energy and cosmological dust matter. Si... |
gr-qc/0508022 | Farid Ya. Khalili | S.L.Danilishin, F.Ya.Khalili | To the practical design of the optical lever intracavity topology of
gravitational-wave detectors | 27 pages, 6 figures | Phys.Rev.D73:022002,2006 | 10.1103/PhysRevD.73.022002 | null | gr-qc | null | The QND intracavity topologies of gravitational-wave detectors proposed
several years ago allow, in principle, to obtain sensitivity significantly
better than the Standard Quantum Limit using relatively small anount of optical
pumping power. In this article we consider an improved more ``practical''
version of the op... | [
{
"created": "Fri, 5 Aug 2005 12:28:44 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Danilishin",
"S. L.",
""
],
[
"Khalili",
"F. Ya.",
""
]
] | The QND intracavity topologies of gravitational-wave detectors proposed several years ago allow, in principle, to obtain sensitivity significantly better than the Standard Quantum Limit using relatively small anount of optical pumping power. In this article we consider an improved more ``practical'' version of the opti... |
1604.04748 | Iver Brevik | I. Brevik, V. V. Obukhov, and A. V. Timoshkin | Inflationary Cosmology Leading to a Soft Type Singularity | 7 pages, no figures, to appear in Mod. Phys. Lett. A. One reference
added | Mod. Phys. Lett. A, Vol 13, No. 18 (2016) 1650105 | 10.1142/S0217732316501054 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A remarkable property of modern cosmology is that it allows for a special
case of symmetry, consisting in the possibility of describing the early-time
acceleration (inflation) and the late-time acceleration using the same
theoretical framework. In this paper we consider various cosmological models
corresponding to a ... | [
{
"created": "Sat, 16 Apr 2016 13:44:35 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Apr 2016 14:17:31 GMT",
"version": "v2"
}
] | 2016-06-14 | [
[
"Brevik",
"I.",
""
],
[
"Obukhov",
"V. V.",
""
],
[
"Timoshkin",
"A. V.",
""
]
] | A remarkable property of modern cosmology is that it allows for a special case of symmetry, consisting in the possibility of describing the early-time acceleration (inflation) and the late-time acceleration using the same theoretical framework. In this paper we consider various cosmological models corresponding to a ge... |
0912.3517 | Enrico Barausse | Enrico Barausse and Alessandra Buonanno (Univ. of Maryland) | An improved effective-one-body Hamiltonian for spinning black-hole
binaries | 22 pages, 9 figures. Minor changes to match version accepted for
publication in PRD | Phys.Rev.D81:084024,2010 | 10.1103/PhysRevD.81.084024 | null | gr-qc astro-ph.CO astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Building on a recent paper in which we computed the canonical Hamiltonian of
a spinning test particle in curved spacetime, at linear order in the particle's
spin, we work out an improved effective-one-body (EOB) Hamiltonian for spinning
black-hole binaries. As in previous descriptions, we endow the effective
particle... | [
{
"created": "Thu, 17 Dec 2009 20:56:28 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Feb 2010 20:25:08 GMT",
"version": "v2"
}
] | 2010-05-12 | [
[
"Barausse",
"Enrico",
"",
"Univ. of Maryland"
],
[
"Buonanno",
"Alessandra",
"",
"Univ. of Maryland"
]
] | Building on a recent paper in which we computed the canonical Hamiltonian of a spinning test particle in curved spacetime, at linear order in the particle's spin, we work out an improved effective-one-body (EOB) Hamiltonian for spinning black-hole binaries. As in previous descriptions, we endow the effective particle n... |
1203.6869 | Torsten Sch\"onfeld | Catherine Meusburger and Torsten Sch\"onfeld | Gauge fixing in (2+1)-gravity with vanishing cosmological constant | Talk given at the Workshop on Noncommutative Field Theory and Gravity
Corfu, September 7 - 11, 2011; 20 pages, 6 figures | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply Dirac's gauge fixing procedure to (2+1)-gravity with vanishing
cosmological constant. For general gauge fixing conditions based on two point
particles, this yields explicit expressions for the Dirac bracket. We explain
how gauge fixing is related to the introduction of an observer into the theory
and show th... | [
{
"created": "Fri, 30 Mar 2012 17:45:18 GMT",
"version": "v1"
},
{
"created": "Thu, 31 May 2012 12:03:10 GMT",
"version": "v2"
}
] | 2012-06-01 | [
[
"Meusburger",
"Catherine",
""
],
[
"Schönfeld",
"Torsten",
""
]
] | We apply Dirac's gauge fixing procedure to (2+1)-gravity with vanishing cosmological constant. For general gauge fixing conditions based on two point particles, this yields explicit expressions for the Dirac bracket. We explain how gauge fixing is related to the introduction of an observer into the theory and show that... |
2202.04253 | Yuki Kawasaki | Yuki Kawasaki, Ryuma Shimizu, Tomohiro Ishikawa, Koji Nagano, Shoki
Iwaguchi, Izyumi Watanabe, Wu Bin, Shuichiro Yokoyama, and Seiji Kawamura | Optimization of Design Parameters for Gravitational Wave Detector DECIGO
Including Fundamental Noises | 16 pages, 8 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The DECi hertz Interferometer Gravitational-Wave Observatory (DECIGO) is a
space gravitational wave (GW) detector. DECIGO was originally designed to be
sensitive enough to observe primordial GW background (PGW). However, due to the
lowered upper limit of the PGW by the Planck observation, further improvement
of the t... | [
{
"created": "Wed, 9 Feb 2022 03:17:37 GMT",
"version": "v1"
}
] | 2022-02-10 | [
[
"Kawasaki",
"Yuki",
""
],
[
"Shimizu",
"Ryuma",
""
],
[
"Ishikawa",
"Tomohiro",
""
],
[
"Nagano",
"Koji",
""
],
[
"Iwaguchi",
"Shoki",
""
],
[
"Watanabe",
"Izyumi",
""
],
[
"Bin",
"Wu",
""
],
[
"Yok... | The DECi hertz Interferometer Gravitational-Wave Observatory (DECIGO) is a space gravitational wave (GW) detector. DECIGO was originally designed to be sensitive enough to observe primordial GW background (PGW). However, due to the lowered upper limit of the PGW by the Planck observation, further improvement of the tar... |
2207.05066 | Yurii Ignat'ev | Yu. G. Ignat'ev | Single-field model of gravitational-scalar instability. I. Evolution of
perturbations | 18 pages, 23 figures, 16 references | Gravit. Cosmol. 28 (2022) 275-290 | 10.1134/S0202289322030045 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | On the basis of the previously formulated mathematical model of a statistical
system with a scalar interaction of fermions and the theory of
gravitational-scalar instability of a cosmological model based on a
two-component statistical system of scalarly charged degenerate fermions, a
numerical model of the cosmologic... | [
{
"created": "Sun, 10 Jul 2022 11:22:24 GMT",
"version": "v1"
}
] | 2022-07-13 | [
[
"Ignat'ev",
"Yu. G.",
""
]
] | On the basis of the previously formulated mathematical model of a statistical system with a scalar interaction of fermions and the theory of gravitational-scalar instability of a cosmological model based on a two-component statistical system of scalarly charged degenerate fermions, a numerical model of the cosmological... |
1409.7872 | Sunil Maharaj | Apratim Ganguly, Sushant G. Ghosh and Sunil D. Maharaj | Accretion onto a black hole in a string cloud background | 9 pages, To appear in Phys. Rev. D | Phys. Rev. D 90, 064037 (2014) | 10.1103/PhysRevD.90.064037 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the accretion process onto the black hole with a string cloud
background, where the horizon of the black hole has an enlarged radius $r_H=2
M/(1-\alpha)$, due to the string cloud parameter $\alpha\; (0 \leq \alpha <
1)$. The problem of stationary, spherically symmetric accretion of a polytropic
fluid is an... | [
{
"created": "Sun, 28 Sep 2014 07:18:50 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Ganguly",
"Apratim",
""
],
[
"Ghosh",
"Sushant G.",
""
],
[
"Maharaj",
"Sunil D.",
""
]
] | We examine the accretion process onto the black hole with a string cloud background, where the horizon of the black hole has an enlarged radius $r_H=2 M/(1-\alpha)$, due to the string cloud parameter $\alpha\; (0 \leq \alpha < 1)$. The problem of stationary, spherically symmetric accretion of a polytropic fluid is anal... |
0807.2055 | Alberto Rozas-Fernandez | Pedro F. Gonz\'alez-D\'iaz and Alberto Rozas-Fern\'andez | Quantum cosmic models and thermodynamics | 15 pages, 1 figure, accepted for publication in Class. Quantum Grav | Class.Quant.Grav.25:175023,2008 | 10.1088/0264-9381/25/17/175023 | IFF-RCA-08-02 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The current accelerating phase of the evolution of the universe is considered
by constructing most economical cosmic models that use just general relativity
and some dominating quantum effects associated with the probabilistic
description of quantum physics. Two of such models are explicitly analyzed.
They are based ... | [
{
"created": "Sun, 13 Jul 2008 19:02:30 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"González-Díaz",
"Pedro F.",
""
],
[
"Rozas-Fernández",
"Alberto",
""
]
] | The current accelerating phase of the evolution of the universe is considered by constructing most economical cosmic models that use just general relativity and some dominating quantum effects associated with the probabilistic description of quantum physics. Two of such models are explicitly analyzed. They are based on... |
2301.13213 | Takuya Takahashi | Takuya Takahashi, Hidetoshi Omiya, Takahiro Tanaka | Evolution of binary systems accompanying axion clouds in extreme mass
ratio inspirals | 15 pages, 13 figures, 1 table | null | 10.1103/PhysRevD.107.103020 | null | gr-qc astro-ph.CO hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | Superradiant instability of rotating black holes (BHs) leads to the formation
of a cloud of ultralight bosons, such as axions. When the BH with the cloud
belongs to a binary system and is in an inspiraling orbit, the resonant
transition between the axion's bound states can occur. We study the history of
the evolution... | [
{
"created": "Mon, 30 Jan 2023 19:00:02 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Feb 2023 13:38:06 GMT",
"version": "v2"
}
] | 2023-05-24 | [
[
"Takahashi",
"Takuya",
""
],
[
"Omiya",
"Hidetoshi",
""
],
[
"Tanaka",
"Takahiro",
""
]
] | Superradiant instability of rotating black holes (BHs) leads to the formation of a cloud of ultralight bosons, such as axions. When the BH with the cloud belongs to a binary system and is in an inspiraling orbit, the resonant transition between the axion's bound states can occur. We study the history of the evolution o... |
gr-qc/9806085 | Dr. Panagiota Kanti | P. Kanti, J. Rizos and K. Tamvakis | Singularity-free cosmological solutions in quadratic gravity | Latex, 25 pages, 6 figures, some explanatory sentences and Comments
added, version to appear in Physical Review D | Phys. Rev. D 59, 083512 (1999) | 10.1103/PhysRevD.59.083512 | null | gr-qc hep-ph hep-th | null | We study a general field theory of a scalar field coupled to gravity through
a quadratic Gauss-Bonnet term $\xi(\phi) R^2_{GB}$. The coupling function has
the form $\xi(\phi)=\phi^n$, where $n$ is a positive integer. In the absence of
the Gauss-Bonnet term, the cosmological solutions for an empty universe and a
unive... | [
{
"created": "Sun, 21 Jun 1998 09:37:00 GMT",
"version": "v1"
},
{
"created": "Sun, 22 Nov 1998 14:09:34 GMT",
"version": "v2"
}
] | 2016-08-25 | [
[
"Kanti",
"P.",
""
],
[
"Rizos",
"J.",
""
],
[
"Tamvakis",
"K.",
""
]
] | We study a general field theory of a scalar field coupled to gravity through a quadratic Gauss-Bonnet term $\xi(\phi) R^2_{GB}$. The coupling function has the form $\xi(\phi)=\phi^n$, where $n$ is a positive integer. In the absence of the Gauss-Bonnet term, the cosmological solutions for an empty universe and a univers... |
2308.10742 | Askar Ali | Askar Ali, Ali \"Ovg\"un | Topological dyonic black holes of massive gravity with generalized
quasitopological electromagnetism | 24 pages and 15 figures | Eur. Phys. J. C (2024) 84:378 | 10.1140/epjc/s10052-024-12710-z | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this paper we investigate new dyonic black holes of massive gravity
sourced by generalized quasitopological electromagnetism in arbitrary
dimensions. We begin by deriving the exact solution to the field equations
defining these black holes and look at how graviton's mass, dimensionality
parameter, and quasitopolog... | [
{
"created": "Mon, 21 Aug 2023 14:15:20 GMT",
"version": "v1"
}
] | 2024-06-11 | [
[
"Ali",
"Askar",
""
],
[
"Övgün",
"Ali",
""
]
] | In this paper we investigate new dyonic black holes of massive gravity sourced by generalized quasitopological electromagnetism in arbitrary dimensions. We begin by deriving the exact solution to the field equations defining these black holes and look at how graviton's mass, dimensionality parameter, and quasitopologic... |
gr-qc/0011010 | Mariano Cadoni | M. Cadoni, P. G. L. Mana | Hamiltonians for a general dilaton gravity theory on a spacetime with a
non-orthogonal, timelike or spacelike outer boundary | 17 pages, 3 figures. Typos corrected | Class.Quant.Grav. 18 (2001) 779-792 | 10.1088/0264-9381/18/5/302 | INFNCA-TH0020 | gr-qc | null | A generalization of two recently proposed general relativity Hamiltonians, to
the case of a general (d+1)-dimensional dilaton gravity theory in a manifold
with a timelike or spacelike outer boundary, is presented.
| [
{
"created": "Fri, 3 Nov 2000 21:00:58 GMT",
"version": "v1"
},
{
"created": "Sun, 5 Nov 2000 12:48:18 GMT",
"version": "v2"
},
{
"created": "Fri, 12 Jan 2001 17:09:53 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Cadoni",
"M.",
""
],
[
"Mana",
"P. G. L.",
""
]
] | A generalization of two recently proposed general relativity Hamiltonians, to the case of a general (d+1)-dimensional dilaton gravity theory in a manifold with a timelike or spacelike outer boundary, is presented. |
1210.4108 | Christian Pfeifer | Mattias N. R. Wohlfarth, Christian Pfeifer | Local spacetime effects on gyroscope systems | 19 pages, 2 figures, journal references added | Phys. Rev. D 87, 024031 (2013) | 10.1103/PhysRevD.87.024031 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give a precise theoretical description of initially aligned sets of
orthogonal gyroscopes which are transported along different paths from some
initial point to the same final point in spacetime. These gyroscope systems can
be used to synchronize separated observers' spatial frames by free fall along
timelike geod... | [
{
"created": "Mon, 15 Oct 2012 17:10:53 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Jan 2013 09:02:00 GMT",
"version": "v2"
}
] | 2013-01-30 | [
[
"Wohlfarth",
"Mattias N. R.",
""
],
[
"Pfeifer",
"Christian",
""
]
] | We give a precise theoretical description of initially aligned sets of orthogonal gyroscopes which are transported along different paths from some initial point to the same final point in spacetime. These gyroscope systems can be used to synchronize separated observers' spatial frames by free fall along timelike geodes... |
0711.4224 | Pop Adrian | Pop Adrian Alin | Perturbations for the Coulomb - Kepler problem on de Sitter space-time | 6 pages | null | null | null | gr-qc | null | In the Schrodinger picture of the Dirac quantum mechanics, defined in charts
with spatially flat Robertson-Walker metrics and Cartesian coordinates the
perturbation theory is applied to the interacting part of the Hamiltonian
operator produced by the minimal coupling with the gravitational field. First
and second ord... | [
{
"created": "Tue, 27 Nov 2007 11:12:10 GMT",
"version": "v1"
}
] | 2007-11-28 | [
[
"Alin",
"Pop Adrian",
""
]
] | In the Schrodinger picture of the Dirac quantum mechanics, defined in charts with spatially flat Robertson-Walker metrics and Cartesian coordinates the perturbation theory is applied to the interacting part of the Hamiltonian operator produced by the minimal coupling with the gravitational field. First and second order... |
1407.0340 | Serguei Krasnikov | S. Krasnikov | Yet another proof of Hawking and Ellis's Lemma 8.5.5 | A few misleading typos are corrected | Class. Quantum Grav. 31 (2014) 227001 | 10.1088/0264-9381/31/22/227001 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The fact that the null generators of a future Cauchy horizon are past
complete was proved first by Hawking and Ellis [1]. Then Budzy\'nski,
Kondracki, and Kr\'olak outlined a proof free from an error found in the
original one [2]. Finally, a week ago Minguzzi published his version of proof
[3] patching a previously u... | [
{
"created": "Tue, 1 Jul 2014 18:11:38 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Oct 2014 12:21:16 GMT",
"version": "v2"
}
] | 2015-06-22 | [
[
"Krasnikov",
"S.",
""
]
] | The fact that the null generators of a future Cauchy horizon are past complete was proved first by Hawking and Ellis [1]. Then Budzy\'nski, Kondracki, and Kr\'olak outlined a proof free from an error found in the original one [2]. Finally, a week ago Minguzzi published his version of proof [3] patching a previously unn... |
gr-qc/0608077 | Kourosh Nozari | Kourosh Nozari and Behnaz Fazlpour | Reissner-Nordstr\"{o}m Black Hole Thermodynamics in Noncommutative
Spaces | 13 pages, no figures, revised version | ActaPhys.Polon.B39:1363,2008; ActaPhys.Polon.B39:1363-1374,2008 | null | null | gr-qc | null | This paper considers the effects of space noncommutativity on the
thermodynamics of a Reissner-Nordstr\"{o}m black hole. In the first step, we
extend the ordinary formalism of Bekenstein-Hawking to the case of charged
black holes in commutative space. In the second step we investigate the effects
of space noncommutat... | [
{
"created": "Wed, 16 Aug 2006 09:41:35 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Dec 2006 11:30:18 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Nozari",
"Kourosh",
""
],
[
"Fazlpour",
"Behnaz",
""
]
] | This paper considers the effects of space noncommutativity on the thermodynamics of a Reissner-Nordstr\"{o}m black hole. In the first step, we extend the ordinary formalism of Bekenstein-Hawking to the case of charged black holes in commutative space. In the second step we investigate the effects of space noncommutativ... |
1507.02765 | Amir Babak Aazami | Amir Babak Aazami, Marcus C. Werner | The geometry of gravitational lensing magnification | 16 pages; v2: minor typos corrected | J. Geom. Phys. 100 (2016) | null | null | gr-qc astro-ph.GA math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a definition of unsigned magnification in gravitational lensing
valid on arbitrary convex normal neighborhoods of time oriented Lorentzian
manifolds. This definition is a function defined at any two points along a null
geodesic that lie in a convex normal neighborhood, and foregoes the usual
notions of len... | [
{
"created": "Fri, 10 Jul 2015 02:22:29 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Jan 2016 11:00:48 GMT",
"version": "v2"
}
] | 2016-01-22 | [
[
"Aazami",
"Amir Babak",
""
],
[
"Werner",
"Marcus C.",
""
]
] | We present a definition of unsigned magnification in gravitational lensing valid on arbitrary convex normal neighborhoods of time oriented Lorentzian manifolds. This definition is a function defined at any two points along a null geodesic that lie in a convex normal neighborhood, and foregoes the usual notions of lens ... |
2404.01834 | Antonina Zinhailo | Alexey Dubinsky, Antonina Zinhailo | Asymptotic decay and quasinormal frequencies of scalar and Dirac fields
around dilaton-de Sitter black holes | 9 pages, 6 figures, 7 tables, revtex | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the decay of Dirac and massive scalar fields at asymptotically late
times in the background of the charged asymptotically de Sitter dilatonic black
holes. It is shown that the asymptotic decay is exponential and oscillatory for
large and intermediate mass of the field, while for zero and small mass it is
pur... | [
{
"created": "Tue, 2 Apr 2024 10:47:01 GMT",
"version": "v1"
}
] | 2024-04-03 | [
[
"Dubinsky",
"Alexey",
""
],
[
"Zinhailo",
"Antonina",
""
]
] | We study the decay of Dirac and massive scalar fields at asymptotically late times in the background of the charged asymptotically de Sitter dilatonic black holes. It is shown that the asymptotic decay is exponential and oscillatory for large and intermediate mass of the field, while for zero and small mass it is pure ... |
1609.08123 | Nirmalya Kajuri | Nirmalya Kajuri | Strong Equivalence Principle in Polymer Quantum Mechanics and deformed
Heisenberg Algebra | 7 pages, to appear in Phys. Rev. D | Phys. Rev. D 94, 084007 (2016) | 10.1103/PhysRevD.94.084007 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Strong equivalence Principle (SEP) states that the description of a
physical system in a gravitational field is indistinguishable from the
description of the same system at rest in an accelerating frame. While this
statement holds true in both General Relativity and ordinary Quantum Mechanics,
one expects it to f... | [
{
"created": "Mon, 26 Sep 2016 19:04:18 GMT",
"version": "v1"
}
] | 2016-10-12 | [
[
"Kajuri",
"Nirmalya",
""
]
] | The Strong equivalence Principle (SEP) states that the description of a physical system in a gravitational field is indistinguishable from the description of the same system at rest in an accelerating frame. While this statement holds true in both General Relativity and ordinary Quantum Mechanics, one expects it to fai... |
gr-qc/0601037 | German Izquierdo | German Izquierdo | Relic gravitational waves and the cosmic accelerated expansion | 4 pages, 2 figures. Uses AIP style. To be published in the AIP
Proceedings of the XXVIII Spanish Relativity Meeting | null | 10.1063/1.2218213 | null | gr-qc | null | The possibility of reconstructing the whole history of the scale factor of
the Universe from the power spectrum of relic gravitational waves (RGWs) makes
the study of these waves quite interesting. First, we explore the impact of a
hypothetical era -right after reheating- dominated by mini black holes and
radiation t... | [
{
"created": "Tue, 10 Jan 2006 10:59:05 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Izquierdo",
"German",
""
]
] | The possibility of reconstructing the whole history of the scale factor of the Universe from the power spectrum of relic gravitational waves (RGWs) makes the study of these waves quite interesting. First, we explore the impact of a hypothetical era -right after reheating- dominated by mini black holes and radiation tha... |
1706.05466 | Chi-Yong Lin | Chen-Yu Liu, Da-Shin Lee, Chi-Yong Lin | Geodesic Motion of Neutral Particles around a Kerr-Newman Black Hole | Published version; 18 pages, 7 figures | Classical and Quantum Gravity 34, 235008 (2017) | 10.1088/1361-6382/aa903b | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the dynamics of a neutral particle around a Kerr-Newman black
hole, and in particular focus on the effects of the charge of the spinning
black hole on the motion of the particle. We first consider the innermost
stable circular orbits (ISCO) on the equatorial plane. It is found that the
presence of the char... | [
{
"created": "Sat, 17 Jun 2017 01:13:49 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Nov 2017 13:39:04 GMT",
"version": "v2"
}
] | 2017-11-15 | [
[
"Liu",
"Chen-Yu",
""
],
[
"Lee",
"Da-Shin",
""
],
[
"Lin",
"Chi-Yong",
""
]
] | We examine the dynamics of a neutral particle around a Kerr-Newman black hole, and in particular focus on the effects of the charge of the spinning black hole on the motion of the particle. We first consider the innermost stable circular orbits (ISCO) on the equatorial plane. It is found that the presence of the charge... |
1001.4311 | David Craig | David A. Craig and Parampreet Singh | Consistent Histories in Quantum Cosmology | To appear in Foundations of Physics special issue on quantum
foundations | Found.Phys.41:371-379,2011 | 10.1007/s10701-010-9422-6 | PI-QG-171 | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We illustrate the crucial role played by decoherence (consistency of quantum
histories) in extracting consistent quantum probabilities for alternative
histories in quantum cosmology. Specifically, within a Wheeler-DeWitt
quantization of a flat Friedmann-Robertson-Walker cosmological model sourced
with a free massless... | [
{
"created": "Mon, 25 Jan 2010 20:51:17 GMT",
"version": "v1"
}
] | 2011-05-26 | [
[
"Craig",
"David A.",
""
],
[
"Singh",
"Parampreet",
""
]
] | We illustrate the crucial role played by decoherence (consistency of quantum histories) in extracting consistent quantum probabilities for alternative histories in quantum cosmology. Specifically, within a Wheeler-DeWitt quantization of a flat Friedmann-Robertson-Walker cosmological model sourced with a free massless s... |
gr-qc/9604031 | Yuri Kubyshin | Yuri Kubyshin and Jerome Martin | On compatibility of the Kaluza-Klein approach with the COBE experiment | LaTeX, 9 pages, 1 Postscript figure, Extended version of the
contribution to the Proceedings of the Xth Workshop on High Energy Physics
and Quantum Field Theory, (Zvenigorod, Russia, 20-26 September, 1995) | null | null | FTUAM 96/16 | gr-qc | null | Contributions of primordial gravitational waves to the large-angular-scale
anisotropies of the cosmic microwave background radiation in multidimensional
cosmological models (Kaluza-Klein models) are studied. We derive limits on free
parameters of the models using results of the COBE experiment and other
astrophysical... | [
{
"created": "Mon, 15 Apr 1996 11:17:25 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kubyshin",
"Yuri",
""
],
[
"Martin",
"Jerome",
""
]
] | Contributions of primordial gravitational waves to the large-angular-scale anisotropies of the cosmic microwave background radiation in multidimensional cosmological models (Kaluza-Klein models) are studied. We derive limits on free parameters of the models using results of the COBE experiment and other astrophysical d... |
2407.17984 | Theodore Anton | Theodore Anton | Relativistic gravity in the inhomogeneous Universe | PhD thesis, 325 pages. Defended 24th June 2024 | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmology is built on a relativistic understanding of gravity, where the
geometry of the Universe is dynamically determined by matter and energy. In the
cosmological concordance model, gravity is described by General Relativity, and
it is assumed that on large scales the Universe is homogeneous and isotropic.
These f... | [
{
"created": "Thu, 25 Jul 2024 12:17:45 GMT",
"version": "v1"
}
] | 2024-07-26 | [
[
"Anton",
"Theodore",
""
]
] | Cosmology is built on a relativistic understanding of gravity, where the geometry of the Universe is dynamically determined by matter and energy. In the cosmological concordance model, gravity is described by General Relativity, and it is assumed that on large scales the Universe is homogeneous and isotropic. These fun... |
gr-qc/9311017 | Domenico Giulini | Domenico Giulini | What is the Geometry of Superspace ? | 10 pages, Plain Tex | Phys.Rev.D51:5630-5635,1995 | 10.1103/PhysRevD.51.5630 | null | gr-qc | null | We investigate certain properties of the Wheeler-DeWitt metric (for constant
lapse) in canonical General Relativity associated with its non-definite nature.
Contribution to the conference on Mach's principle: "From Newtons Bucket to
Quantum Gravity", July 26-30 1993, Tuebingen, Germany
| [
{
"created": "Wed, 10 Nov 1993 21:49:38 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Giulini",
"Domenico",
""
]
] | We investigate certain properties of the Wheeler-DeWitt metric (for constant lapse) in canonical General Relativity associated with its non-definite nature. Contribution to the conference on Mach's principle: "From Newtons Bucket to Quantum Gravity", July 26-30 1993, Tuebingen, Germany |
gr-qc/0702016 | Bernard Kelly | Dae-Il Choi, Bernard J. Kelly, William D. Boggs, John G. Baker, Joan
Centrella, James van Meter | Recoiling from a kick in the head-on collision of spinning black holes | 12 pages, 10 figures. Replaced with published version, including more
discussion of convergence and properties of final hole | Phys.Rev.D76:104026,2007 | 10.1103/PhysRevD.76.104026 | null | gr-qc | null | Recoil ``kicks'' induced by gravitational radiation are expected in the
inspiral and merger of black holes. Recently the numerical relativity community
has begun to measure the significant kicks found when both unequal masses and
spins are considered. Because understanding the cause and magnitude of each
component of... | [
{
"created": "Fri, 2 Feb 2007 20:55:18 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Nov 2007 20:36:39 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Choi",
"Dae-Il",
""
],
[
"Kelly",
"Bernard J.",
""
],
[
"Boggs",
"William D.",
""
],
[
"Baker",
"John G.",
""
],
[
"Centrella",
"Joan",
""
],
[
"van Meter",
"James",
""
]
] | Recoil ``kicks'' induced by gravitational radiation are expected in the inspiral and merger of black holes. Recently the numerical relativity community has begun to measure the significant kicks found when both unequal masses and spins are considered. Because understanding the cause and magnitude of each component of t... |
gr-qc/0307015 | Pablo Laguna | U. Sperhake, K.L. Smith, B. Kelly, P. Laguna and D. Shoemaker | Impact of densitized lapse slicings on evolutions of a wobbling black
hole | 10 pages, 8 figures | Phys.Rev.D69:024012,2004 | 10.1103/PhysRevD.69.024012 | null | gr-qc | null | We present long-term stable and second-order convergent evolutions of an
excised wobbling black hole. Our results clearly demonstrate that the use of a
densitized lapse function extends the lifetime of simulations dramatically. We
also show the improvement in the stability of single static black holes when an
algebra... | [
{
"created": "Thu, 3 Jul 2003 21:15:00 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Sperhake",
"U.",
""
],
[
"Smith",
"K. L.",
""
],
[
"Kelly",
"B.",
""
],
[
"Laguna",
"P.",
""
],
[
"Shoemaker",
"D.",
""
]
] | We present long-term stable and second-order convergent evolutions of an excised wobbling black hole. Our results clearly demonstrate that the use of a densitized lapse function extends the lifetime of simulations dramatically. We also show the improvement in the stability of single static black holes when an algebraic... |
2405.09791 | Peiran Yin | Peiran Yin, Rui Li, Chengjiang Yin, Xiangyu Xu, Xiang Bian, Han Xie,
Chang-Kui Duan, Pu Huang, Jian-hua He, Jiangfeng Du | Challenging theories of dark energy with levitated force sensor | null | Nature Physics 18, 1181-1185 (2022) | 10.1038/s41567-022-01706-9 | null | gr-qc astro-ph.IM physics.ins-det | http://creativecommons.org/licenses/by-nc-sa/4.0/ | The nature of dark energy is one of the most outstanding problems in physical
science, and various theories have been proposed. It is therefore essential to
directly verify or rule out these theories experimentally. However, despite
substantial efforts in astrophysical observations and laboratory experiments,
previou... | [
{
"created": "Thu, 16 May 2024 03:42:15 GMT",
"version": "v1"
}
] | 2024-05-17 | [
[
"Yin",
"Peiran",
""
],
[
"Li",
"Rui",
""
],
[
"Yin",
"Chengjiang",
""
],
[
"Xu",
"Xiangyu",
""
],
[
"Bian",
"Xiang",
""
],
[
"Xie",
"Han",
""
],
[
"Duan",
"Chang-Kui",
""
],
[
"Huang",
"Pu",
... | The nature of dark energy is one of the most outstanding problems in physical science, and various theories have been proposed. It is therefore essential to directly verify or rule out these theories experimentally. However, despite substantial efforts in astrophysical observations and laboratory experiments, previous ... |
1309.0552 | Jerzy Matyjasek | Jerzy Matyjasek and Pawe{\l} Sadurski | Stress-Energy Tensor of the Quantized Massive Fields in
Friedman-Robertson-Walker Spacetimes | Section III expanded. References added. Matches published version | Phys. Rev. D 88, 104015 (2013) | 10.1103/PhysRevD.88.104015 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The approximate stress-energy tensor of the quantized massive scalar, spinor
and vector fields in the spatially flat Friedman-Robertson-Walker universe is
constructed. It is shown that for the scalar fields with arbitrary curvature
coupling, $\xi,$ the stress-energy tensor calculated within the framework of
the Schwi... | [
{
"created": "Mon, 2 Sep 2013 22:12:18 GMT",
"version": "v1"
},
{
"created": "Sun, 17 Nov 2013 10:56:02 GMT",
"version": "v2"
}
] | 2013-11-19 | [
[
"Matyjasek",
"Jerzy",
""
],
[
"Sadurski",
"Paweł",
""
]
] | The approximate stress-energy tensor of the quantized massive scalar, spinor and vector fields in the spatially flat Friedman-Robertson-Walker universe is constructed. It is shown that for the scalar fields with arbitrary curvature coupling, $\xi,$ the stress-energy tensor calculated within the framework of the Schwing... |
2301.04448 | Hrvoje Nikolic | Hrvoje Nikolic | Emergent diffeomorphism invariance in toy models | 21 pages, accepted for publication in Fortsch. Phys | Fortschr. Phys. 71, 2300026 (2023) | 10.1002/prop.202300026 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Conceptual difficulties in semiclassical and quantum gravity arise from
diffeomorphism invariance of classical general relativity. With a motivation to
shed some light on these difficulties, we study a class of toy models for which
one-dimensional diffeomorphism invariance, namely time-reparametrization
invariance, e... | [
{
"created": "Wed, 11 Jan 2023 13:08:55 GMT",
"version": "v1"
},
{
"created": "Mon, 15 May 2023 12:45:23 GMT",
"version": "v2"
}
] | 2023-09-07 | [
[
"Nikolic",
"Hrvoje",
""
]
] | Conceptual difficulties in semiclassical and quantum gravity arise from diffeomorphism invariance of classical general relativity. With a motivation to shed some light on these difficulties, we study a class of toy models for which one-dimensional diffeomorphism invariance, namely time-reparametrization invariance, eme... |
1008.0524 | James D. E. Grant | James D. E. Grant | Areas and volumes for null cones | 16 pages, no figures. Typos fixed. One garbled proof corrected.
Published version | Annales Henri Poincare 12:965-985,2011 | 10.1007/s00023-011-0090-7 | null | gr-qc math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by recent work of Choquet-Bruhat, Chrusciel, and Martin-Garcia, we
prove monotonicity properties and comparison results for the area of slices of
the null cone of a point in a Lorentzian manifold. We also prove volume
comparison results for subsets of the null cone analogous to the Bishop-Gromov
relative vo... | [
{
"created": "Tue, 3 Aug 2010 11:38:07 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Dec 2011 08:42:13 GMT",
"version": "v2"
}
] | 2011-12-02 | [
[
"Grant",
"James D. E.",
""
]
] | Motivated by recent work of Choquet-Bruhat, Chrusciel, and Martin-Garcia, we prove monotonicity properties and comparison results for the area of slices of the null cone of a point in a Lorentzian manifold. We also prove volume comparison results for subsets of the null cone analogous to the Bishop-Gromov relative volu... |
2312.05266 | Peter K.F. Kuhfittig | Peter K.F. Kuhfittig | On the status of wormholes in Einstein's theory | 18 pages, no figures | Letters in High Energy Physics (LHEP), vol. 2023, ID: 469, 2023 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been claimed that wormholes are just as good a prediction of
Einstein's theory as black holes, but they are subject to severe restrictions
from quantum field theory. The purpose of this paper is to show that the claim
can be substantiated in spite of these restrictions.
| [
{
"created": "Wed, 6 Dec 2023 12:48:20 GMT",
"version": "v1"
}
] | 2023-12-12 | [
[
"Kuhfittig",
"Peter K. F.",
""
]
] | It has been claimed that wormholes are just as good a prediction of Einstein's theory as black holes, but they are subject to severe restrictions from quantum field theory. The purpose of this paper is to show that the claim can be substantiated in spite of these restrictions. |
gr-qc/9801091 | Cristian Martinez | Cristian Martinez | Instability of three dimensional conformally dressed black hole | 5 pages, REVTeX | Phys.Rev. D58 (1998) 027501 | 10.1103/PhysRevD.58.027501 | null | gr-qc | null | The three dimensional black hole solution of Einstein equations with negative
cosmological constant coupled to a conformal scalar field is proved to be
unstable against linear circularly symmetric perturbations.
| [
{
"created": "Tue, 27 Jan 1998 15:46:46 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Martinez",
"Cristian",
""
]
] | The three dimensional black hole solution of Einstein equations with negative cosmological constant coupled to a conformal scalar field is proved to be unstable against linear circularly symmetric perturbations. |
0905.2502 | Christian Corda | Christian Corda | Interferometric detection of gravitational waves: the definitive test
for General Relativity | This Essay is an Honorable Mention Winner at the 2009 Gravity
Research Foundation Awards | Int. J. Mod. Phys. D18:2275-2282,2009 | 10.1142/S0218271809015904 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Even if Einstein's General Relativity achieved a great success and overcame
lots of experimental tests, it also showed some shortcomings and flaws which
today advise theorists to ask if it is the definitive theory of gravity. In
this essay we show that, if advanced projects on the detection of Gravitational
Waves (GW... | [
{
"created": "Fri, 15 May 2009 10:01:24 GMT",
"version": "v1"
},
{
"created": "Wed, 27 May 2009 15:52:41 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Jun 2009 14:45:09 GMT",
"version": "v3"
}
] | 2010-04-21 | [
[
"Corda",
"Christian",
""
]
] | Even if Einstein's General Relativity achieved a great success and overcame lots of experimental tests, it also showed some shortcomings and flaws which today advise theorists to ask if it is the definitive theory of gravity. In this essay we show that, if advanced projects on the detection of Gravitational Waves (GWs)... |
2310.02958 | Aron Wall | Aron C. Wall | What if Quantum Gravity is "just'' Quantum Information Theory? | 6 pages, 2 figures. Additional references added to arxiv version | Proc. 28th Solvay Conf. Phys., ed. D. Gross, A. Sevrin, P. Zoller,
World Scientific Publishing Co., Singapore, 2023 | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I suggest the possibility that holographic quantum gravity is, in some sense,
equivalent to quantum information theory. Some radical implications would
follow. First, the theory of quantum gravity should have no adjustable coupling
constants, similar to string theory. Thus, all complete bulk theories of
quantum gravi... | [
{
"created": "Wed, 4 Oct 2023 16:48:10 GMT",
"version": "v1"
}
] | 2023-10-05 | [
[
"Wall",
"Aron C.",
""
]
] | I suggest the possibility that holographic quantum gravity is, in some sense, equivalent to quantum information theory. Some radical implications would follow. First, the theory of quantum gravity should have no adjustable coupling constants, similar to string theory. Thus, all complete bulk theories of quantum gravity... |
1410.2069 | Iver Brevik | Iver Brevik | Brane Viscous Cosmology in the Plasma Era | 8 pages, no figures; to appear in Astrophys. Space Sci | Astrophysics and Space Science 355, 179-185 (2015) | 10.1007/s10509-014-2162-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider how the five-dimensional Randall-Sundrum (one-brane) theory
becomes modified when account is taken of the bulk viscosity of the cosmic
fluid on the brane. We focus on the plasma era between $10^{12}$K (muon pair
annihilation) to about $5\times 10^9$K (electron-positron annihilation), which
includes the fi... | [
{
"created": "Wed, 8 Oct 2014 11:52:26 GMT",
"version": "v1"
}
] | 2015-02-23 | [
[
"Brevik",
"Iver",
""
]
] | We consider how the five-dimensional Randall-Sundrum (one-brane) theory becomes modified when account is taken of the bulk viscosity of the cosmic fluid on the brane. We focus on the plasma era between $10^{12}$K (muon pair annihilation) to about $5\times 10^9$K (electron-positron annihilation), which includes the firs... |
2306.10445 | Zhoujian Cao Dr | Li-Fang Li and Zhoujian Cao | Post-Keplerian waveform model for binary compact object as sources of
space-based gravitational wave detector and its implications | 14 pages, 3 figures | General Relativity and Gravitation, 55, 76 (2023) | 10.1007/s10714-023-03123-6 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | Binary compact objects will be among the important sources for the future
space-based gravitational wave detectors. Such binary compact objects include
stellar massive binary black hole, binary neutron star, binary white dwarf and
mixture of these compact objects. Regarding to the relatively low frequency,
the gravit... | [
{
"created": "Sun, 18 Jun 2023 00:45:06 GMT",
"version": "v1"
}
] | 2023-06-21 | [
[
"Li",
"Li-Fang",
""
],
[
"Cao",
"Zhoujian",
""
]
] | Binary compact objects will be among the important sources for the future space-based gravitational wave detectors. Such binary compact objects include stellar massive binary black hole, binary neutron star, binary white dwarf and mixture of these compact objects. Regarding to the relatively low frequency, the gravitat... |
gr-qc/9409026 | null | Juan Garcia-Bellido | Quantum Fluctuations of Planck Mass as Mutation Mechanism in a Theory of
Evolution of the Universe | 3 pages, Stanford University preprint SU-ITP-94-32, IEM-FT-92/94 | null | null | null | gr-qc astro-ph | null | Contributed talk at the Seventh Marcel Grossman Meeting on Gravity, June
24-30. A theory of evolution of the universe requires both a mutation mechanism
and a selection mechanism. We believe that both can be encountered in the
stochastic approach to quantum cosmology. In Brans-Dicke chaotic inflation, the
quantum flu... | [
{
"created": "Tue, 13 Sep 1994 21:06:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Garcia-Bellido",
"Juan",
""
]
] | Contributed talk at the Seventh Marcel Grossman Meeting on Gravity, June 24-30. A theory of evolution of the universe requires both a mutation mechanism and a selection mechanism. We believe that both can be encountered in the stochastic approach to quantum cosmology. In Brans-Dicke chaotic inflation, the quantum fluct... |
1809.10412 | Matt Visser | Ivan Booth (University of Newfoundland), Bradley Creelman (University
of Newfoundland), Jessica Santiago (Victoria University of Wellington), and
Matt Visser (Victoria University of Wellington) | Evading the Trans-Planckian problem with Vaidya spacetimes | 32 pages; 5 figures | null | 10.1088/1475-7516/2019/09/067 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hawking radiation, when treated in the ray optics limit, exhibits the
unfortunate trans-Planckian problem --- a Hawking photon near spatial infinity,
if back-tracked to the immediate vicinity of the horizon is hugely blue-shifted
and found to have had trans-Planckian energy. (And if back-tracked all the way
to the ho... | [
{
"created": "Thu, 27 Sep 2018 09:00:37 GMT",
"version": "v1"
}
] | 2019-10-09 | [
[
"Booth",
"Ivan",
"",
"University of Newfoundland"
],
[
"Creelman",
"Bradley",
"",
"University\n of Newfoundland"
],
[
"Santiago",
"Jessica",
"",
"Victoria University of Wellington"
],
[
"Visser",
"Matt",
"",
"Victoria University of Welli... | Hawking radiation, when treated in the ray optics limit, exhibits the unfortunate trans-Planckian problem --- a Hawking photon near spatial infinity, if back-tracked to the immediate vicinity of the horizon is hugely blue-shifted and found to have had trans-Planckian energy. (And if back-tracked all the way to the hori... |
gr-qc/9611029 | Jose Acacio de Barros | J. Acacio de Barros (Physics Department/UFJF, Brazil) and N.
Pinto-Neto (CBPF/Lafex, Brazil) | Comments on the Quantum Potential Approach to a Class of Quantum
Cosmological Models | 7 pages, LaTeX | Class.Quant.Grav. 14 (1997) 1993-1995 | 10.1088/0264-9381/14/7/030 | null | gr-qc quant-ph | null | In this comment we bring attention to the fact that when we apply the
ontological interpretation of quantum mechanics, we must be sure to use it in
the coordinate representation. This is particularly important when canonical
tranformations that mix momenta and coordinates are present. This implies that
some of the re... | [
{
"created": "Mon, 11 Nov 1996 19:11:38 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"de Barros",
"J. Acacio",
"",
"Physics Department/UFJF, Brazil"
],
[
"Pinto-Neto",
"N.",
"",
"CBPF/Lafex, Brazil"
]
] | In this comment we bring attention to the fact that when we apply the ontological interpretation of quantum mechanics, we must be sure to use it in the coordinate representation. This is particularly important when canonical tranformations that mix momenta and coordinates are present. This implies that some of the resu... |
1801.01350 | Giovanni Camelio | Giovanni Camelio | Early evolution of newly born proto-neutron stars | Minor modification to my PhD thesis. Partial overlap with
arXiv:1601.02945 [Camelio et al., PRD, 2016] and arXiv:1704.01923 [Camelio et
al., PRD, 2017]. Original version available at:
http://hdl.handle.net/11573/942744 | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A proto-neutron star (PNS) is the first phase of life of a neutron star, and
is likely to origin from a core-collapse supernova. After about 200 ms from
core-collapse, the PNS evolution may be modeled as a sequence of
quasi-stationary configurations. These configurations depend on the PNS
thermodynamic profiles, whos... | [
{
"created": "Thu, 4 Jan 2018 13:52:20 GMT",
"version": "v1"
}
] | 2018-01-08 | [
[
"Camelio",
"Giovanni",
""
]
] | A proto-neutron star (PNS) is the first phase of life of a neutron star, and is likely to origin from a core-collapse supernova. After about 200 ms from core-collapse, the PNS evolution may be modeled as a sequence of quasi-stationary configurations. These configurations depend on the PNS thermodynamic profiles, whose ... |
1108.5618 | Drew Keppel | Kipp Cannon, Chad Hanna, Drew Keppel | Interpolating compact binary waveforms using the singular value
decomposition | 5 pages, 3 figures, presented at the joint 9th Edoardo Amaldi
Conference on Gravitational Waves and 2011 Numerical Relativity - Data
Analysis (NRDA) meeting | null | 10.1103/PhysRevD.85.081504 | LIGO-P1100101-v2 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Compact binary systems with total masses between tens and hundreds of solar
masses will produce gravitational waves during their merger phase that are
detectable by second-generation ground-based gravitational-wave detectors. In
order to model the gravitational waveform of the merger epoch of compact binary
coalescen... | [
{
"created": "Mon, 29 Aug 2011 15:49:35 GMT",
"version": "v1"
}
] | 2013-05-30 | [
[
"Cannon",
"Kipp",
""
],
[
"Hanna",
"Chad",
""
],
[
"Keppel",
"Drew",
""
]
] | Compact binary systems with total masses between tens and hundreds of solar masses will produce gravitational waves during their merger phase that are detectable by second-generation ground-based gravitational-wave detectors. In order to model the gravitational waveform of the merger epoch of compact binary coalescence... |
gr-qc/0304049 | Hongya Liu | Lixin Xu, Hongya Liu, Beili Wang | On the Big Bounce Singularity of a Simple 5D Cosmological Model | Revtex, 10 pages, 2 figures, references added | Chin. Phys. Lett. 20 (2003) 995-998 | 10.1088/0256-307X/20/7/307 | null | gr-qc astro-ph | null | The big bounce singularity of a simple 5D cosmological model is studied.
Contrary to the standard big bang space-time singularity, this big bounce
singularity is found to be an event horizon at which the scale factor and the
mass density of the universe are finite, while the pressure undergoes a sudden
transition fro... | [
{
"created": "Sun, 13 Apr 2003 11:52:42 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Jul 2003 02:18:17 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Xu",
"Lixin",
""
],
[
"Liu",
"Hongya",
""
],
[
"Wang",
"Beili",
""
]
] | The big bounce singularity of a simple 5D cosmological model is studied. Contrary to the standard big bang space-time singularity, this big bounce singularity is found to be an event horizon at which the scale factor and the mass density of the universe are finite, while the pressure undergoes a sudden transition from ... |
gr-qc/0209024 | Vojtich Pravda | V. Pravda, A. Pravdova, A. Coley, R. Milson | All spacetimes with vanishing curvature invariants | 24 pages | Class.Quant.Grav.19:6213-6236,2002 | 10.1088/0264-9381/19/23/318 | null | gr-qc | null | All Lorentzian spacetimes with vanishing invariants constructed from the
Riemann tensor and its covariant derivatives are determined. A subclass of the
Kundt spacetimes results and we display the corresponding metrics in local
coordinates. Some potential applications of these spacetimes are discussed.
| [
{
"created": "Sat, 7 Sep 2002 19:46:43 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Pravda",
"V.",
""
],
[
"Pravdova",
"A.",
""
],
[
"Coley",
"A.",
""
],
[
"Milson",
"R.",
""
]
] | All Lorentzian spacetimes with vanishing invariants constructed from the Riemann tensor and its covariant derivatives are determined. A subclass of the Kundt spacetimes results and we display the corresponding metrics in local coordinates. Some potential applications of these spacetimes are discussed. |
2206.07031 | Thomas Osburn | Thomas Osburn and Nami Nishimura | New self-force method via elliptic partial differential equations for
Kerr inspiral models | Updated to match the published version | Physical Review D 106, 044056 (2022) | 10.1103/PhysRevD.106.044056 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new method designed to avoid numerical challenges that have
impeded calculation of the Lorenz gauge self-force acting on a compact object
inspiraling into a Kerr black hole. This type of calculation is valuable in
creating waveform templates for extreme mass-ratio inspirals, which are an
important source... | [
{
"created": "Tue, 14 Jun 2022 17:52:17 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Sep 2022 20:27:15 GMT",
"version": "v2"
}
] | 2022-09-08 | [
[
"Osburn",
"Thomas",
""
],
[
"Nishimura",
"Nami",
""
]
] | We present a new method designed to avoid numerical challenges that have impeded calculation of the Lorenz gauge self-force acting on a compact object inspiraling into a Kerr black hole. This type of calculation is valuable in creating waveform templates for extreme mass-ratio inspirals, which are an important source o... |
1810.13119 | Sebastian Kish | Sebastian P. Kish, Timothy C. Ralph | Quantum Metrology in the Kerr Metric | 9 pages, 7 figures, closest to published version | Phys. Rev. D 99, 124015 (2019) | 10.1103/PhysRevD.99.124015 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A surprising feature of the Kerr metric is the anisotropy of the speed of
light. The angular momentum of a rotating massive object causes co- and
counter-propagating light paths to move at faster and slower velocities,
respectively as determined by a far-away clock. Based on this effect we derive
ultimate quantum lim... | [
{
"created": "Wed, 31 Oct 2018 06:26:12 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Jun 2019 03:01:11 GMT",
"version": "v2"
}
] | 2019-06-14 | [
[
"Kish",
"Sebastian P.",
""
],
[
"Ralph",
"Timothy C.",
""
]
] | A surprising feature of the Kerr metric is the anisotropy of the speed of light. The angular momentum of a rotating massive object causes co- and counter-propagating light paths to move at faster and slower velocities, respectively as determined by a far-away clock. Based on this effect we derive ultimate quantum limit... |
2401.05775 | Andronikos Paliathanasis | Andronikos Paliathanasis | Classical and Quantum solutions in Scalar field cosmology via the
Eisenhart lift and linearization | 18 pages, no figures | null | null | null | gr-qc hep-ph math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | This study introduces a novel approach for solving the cosmological field
equations within scalar field theory by employing the Eisenhart lift. The field
equations are reformulated as a system of geodesic equations for the Eisenhart
metric. In the case of an exponential potential, the Eisenhart metric is shown
to be ... | [
{
"created": "Thu, 11 Jan 2024 09:27:23 GMT",
"version": "v1"
}
] | 2024-01-12 | [
[
"Paliathanasis",
"Andronikos",
""
]
] | This study introduces a novel approach for solving the cosmological field equations within scalar field theory by employing the Eisenhart lift. The field equations are reformulated as a system of geodesic equations for the Eisenhart metric. In the case of an exponential potential, the Eisenhart metric is shown to be co... |
gr-qc/0401034 | Eric Black | Eric D. Black, Akira Villar, Kyle Barbary, Adam Bushmaker, Jay
Heefner, Seiji Kawamura, Fumiko Kawazoe, Luca Matone, Sharon Meidt, Shanti R.
Rao, Kevin Schulz, Michael Zhang, and Kenneth G. Libbrecht | Direct Observation of Broadband Coating Thermal Noise in a Suspended
Interferometer | Final version synchronized with publication in Phys. Lett. A | Phys.Lett. A328 (2004) 1-5 | 10.1016/j.physleta.2004.05.052 | null | gr-qc | null | We have directly observed broadband thermal noise in silica/tantala coatings
in a high-sensitivity Fabry-Perot interferometer. Our result agrees well with
the prediction based on indirect, ring-down measurements of coating mechanical
loss, validating that method as a tool for the development of advanced
interferometr... | [
{
"created": "Fri, 9 Jan 2004 22:11:00 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Apr 2005 21:38:28 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Black",
"Eric D.",
""
],
[
"Villar",
"Akira",
""
],
[
"Barbary",
"Kyle",
""
],
[
"Bushmaker",
"Adam",
""
],
[
"Heefner",
"Jay",
""
],
[
"Kawamura",
"Seiji",
""
],
[
"Kawazoe",
"Fumiko",
""
],
[
"Ma... | We have directly observed broadband thermal noise in silica/tantala coatings in a high-sensitivity Fabry-Perot interferometer. Our result agrees well with the prediction based on indirect, ring-down measurements of coating mechanical loss, validating that method as a tool for the development of advanced interferometric... |
1608.00559 | Sergio Ulhoa | S.C. Ulhoa, A.F. Santos, Faqir C. Khanna | Scattering of Fermions by Gravitons | null | Gen Relativ Gravit (2017) 49: 54 | 10.1007/s10714-017-2218-7 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The interaction between gravitons and fermions is investigated in the
teleparallel gravity. The scattering of fermions and gravitons in the weak
field approximation is analyzed. The transition amplitudes of
M$\varnothing$ller, Compton and new gravitational scattering are calculated.
| [
{
"created": "Fri, 29 Jul 2016 23:39:11 GMT",
"version": "v1"
}
] | 2017-11-30 | [
[
"Ulhoa",
"S. C.",
""
],
[
"Santos",
"A. F.",
""
],
[
"Khanna",
"Faqir C.",
""
]
] | The interaction between gravitons and fermions is investigated in the teleparallel gravity. The scattering of fermions and gravitons in the weak field approximation is analyzed. The transition amplitudes of M$\varnothing$ller, Compton and new gravitational scattering are calculated. |
2307.05011 | Tanmoy Paul | Shin'ichi Nojiri, Sergei D. Odintsov, Tanmoy Paul, Soumitra SenGupta | Horizon entropy consistent with FLRW equations for general modified
theories of gravity and for all EoS of the matter field | PRD Accepted | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The question that continues to hinge the interrelation between cosmology and
thermodynamics is broadly described as -- what is the form of horizon entropy
that links the Friedmann equations for a "$general$" gravity theory with the
underlying thermodynamics of the apparent horizon? The answer to this question
was kno... | [
{
"created": "Tue, 11 Jul 2023 04:49:50 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Jan 2024 09:19:12 GMT",
"version": "v2"
}
] | 2024-01-30 | [
[
"Nojiri",
"Shin'ichi",
""
],
[
"Odintsov",
"Sergei D.",
""
],
[
"Paul",
"Tanmoy",
""
],
[
"SenGupta",
"Soumitra",
""
]
] | The question that continues to hinge the interrelation between cosmology and thermodynamics is broadly described as -- what is the form of horizon entropy that links the Friedmann equations for a "$general$" gravity theory with the underlying thermodynamics of the apparent horizon? The answer to this question was known... |
2310.05987 | Pardyumn Kumar Sahoo | Aaqid Bhat, Sanjay Mandal, P.K. Sahoo | Slow-roll inflation in $f(T,\mathcal{T})$ modified gravity | Chinese Physics C published version | Chinese Physics C volume 47 issue 12 (2023) 125104 | 10.1088/1674-1137/ad010f | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this article, we explore the concept of cosmological inflation within the
framework of the $f (T,\mathcal{T})$ theory of gravity, where $f$ is a general
function of the Torsion scalar $T$ and the trace, $\mathcal{T}$, of the
energy-momentum tensor. It is assumed that the conditions of slow-roll
inflation are appli... | [
{
"created": "Sat, 7 Oct 2023 09:22:39 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Oct 2023 09:00:06 GMT",
"version": "v2"
}
] | 2023-11-14 | [
[
"Bhat",
"Aaqid",
""
],
[
"Mandal",
"Sanjay",
""
],
[
"Sahoo",
"P. K.",
""
]
] | In this article, we explore the concept of cosmological inflation within the framework of the $f (T,\mathcal{T})$ theory of gravity, where $f$ is a general function of the Torsion scalar $T$ and the trace, $\mathcal{T}$, of the energy-momentum tensor. It is assumed that the conditions of slow-roll inflation are applica... |
1607.07601 | Luc Blanchet | Tanguy Marchand, Luc Blanchet, Guillaume Faye | Gravitational-wave tail effects to quartic non-linear order | 32 pages, no figure, matches with published version | Classical and Quantum Gravity, 2016, 33, 244003 | 10.1088/0264-9381/33/24/244003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational-wave tails are due to the backscattering of linear waves onto
the space-time curvature generated by the total mass of the matter source. The
dominant tails correspond to quadratic non-linear interactions and arise at the
one-and-a-half post-Newtonian (1.5PN) order in the gravitational waveform. The
"tai... | [
{
"created": "Tue, 26 Jul 2016 09:19:09 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Nov 2016 09:41:12 GMT",
"version": "v2"
}
] | 2016-12-07 | [
[
"Marchand",
"Tanguy",
""
],
[
"Blanchet",
"Luc",
""
],
[
"Faye",
"Guillaume",
""
]
] | Gravitational-wave tails are due to the backscattering of linear waves onto the space-time curvature generated by the total mass of the matter source. The dominant tails correspond to quadratic non-linear interactions and arise at the one-and-a-half post-Newtonian (1.5PN) order in the gravitational waveform. The "tails... |
1309.2454 | Jose Luis Hernandez-Pastora | J.L. Hernandez-Pastora | Linearized multipole solutions and their representation | 32 pages, 2 figures | 2013 Class. Quantum Grav. 30 175003 | 10.1088/0264-9381/30/17/175003 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The monopole solution of the Einstein vacuum field equations (Schwarzschild`s
solution) in Weyl coordinates involves a metric function that can be
interpreted as the gravitational potential of a bar of length $2m$ with
constant linear density. The question addressed in this work is whether similar
representations can... | [
{
"created": "Tue, 10 Sep 2013 10:43:01 GMT",
"version": "v1"
}
] | 2013-09-11 | [
[
"Hernandez-Pastora",
"J. L.",
""
]
] | The monopole solution of the Einstein vacuum field equations (Schwarzschild`s solution) in Weyl coordinates involves a metric function that can be interpreted as the gravitational potential of a bar of length $2m$ with constant linear density. The question addressed in this work is whether similar representations can b... |
1601.00868 | Antonin Coutant | Antonin Coutant, Florent Michel, Renaud Parentani | Dynamical instabilities and quasi-normal modes, a spectral analysis with
applications to black-hole physics | 31 pages, 13 figures. Small clarifications, title changed, matches
published version | Class. Quant. Grav. 33 (2016) 125032 | 10.1088/0264-9381/33/12/125032 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Black hole dynamical instabilities have been mostly studied in specific
models. We here study the general properties of the complex-frequency modes
responsible for such instabilities, guided by the example of a charged scalar
field in an electrostatic potential. We show that these modes are square
integrable, have a ... | [
{
"created": "Tue, 5 Jan 2016 15:41:00 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Jul 2016 10:18:50 GMT",
"version": "v2"
}
] | 2016-07-04 | [
[
"Coutant",
"Antonin",
""
],
[
"Michel",
"Florent",
""
],
[
"Parentani",
"Renaud",
""
]
] | Black hole dynamical instabilities have been mostly studied in specific models. We here study the general properties of the complex-frequency modes responsible for such instabilities, guided by the example of a charged scalar field in an electrostatic potential. We show that these modes are square integrable, have a va... |
gr-qc/0605007 | James Lindesay | James Lindesay | An Introduction of Multiple Scales in a Dynamical Cosmology | 8 pages, minor typo correction | null | null | null | gr-qc | null | The discovery of scale acceleration evidenced from supernovae luminosities
and spatial flatness of feature evolution in the cosmic microwave background
presents a challenge to the understanding of the evolution of cosmological
vacuum energy. Although some scenarios prefer a fixed cosmological constant
with dynamics g... | [
{
"created": "Mon, 1 May 2006 14:14:15 GMT",
"version": "v1"
},
{
"created": "Tue, 9 May 2006 02:26:44 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Lindesay",
"James",
""
]
] | The discovery of scale acceleration evidenced from supernovae luminosities and spatial flatness of feature evolution in the cosmic microwave background presents a challenge to the understanding of the evolution of cosmological vacuum energy. Although some scenarios prefer a fixed cosmological constant with dynamics gov... |
1904.08068 | Manuel Gonzalez-Espinoza | Manuel Gonzalez-Espinoza, Giovanni Otalora, Nelson Videla, Joel
Saavedra | Slow-roll inflation in generalized scalar-torsion gravity | Accepted for publication in JCAP | null | 10.1088/1475-7516/2019/08/029 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the dynamics of inflation in a generalized scalar-torsion gravity
scenario by assuming a canonical scalar field non-minimally coupled to torsion
with a Galileon-type self-interaction. After obtaining the field equations for
a flat FRW background, we derive the second order action for both scalar and
tensor p... | [
{
"created": "Wed, 17 Apr 2019 03:38:26 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Aug 2019 01:41:55 GMT",
"version": "v2"
}
] | 2019-08-26 | [
[
"Gonzalez-Espinoza",
"Manuel",
""
],
[
"Otalora",
"Giovanni",
""
],
[
"Videla",
"Nelson",
""
],
[
"Saavedra",
"Joel",
""
]
] | We study the dynamics of inflation in a generalized scalar-torsion gravity scenario by assuming a canonical scalar field non-minimally coupled to torsion with a Galileon-type self-interaction. After obtaining the field equations for a flat FRW background, we derive the second order action for both scalar and tensor per... |
2010.04047 | Simone Mastrogiovanni | S. Mastrogiovanni, L. Haegel, C. Karathanasis, I. Magana-Hernandez, D.
A. Steer | Gravitational wave friction in light of GW170817 and GW190521 | 17 pages, 6 figures, submitted to JCAP | null | 10.1088/1475-7516/2021/02/043 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the gravitational wave (GW) events GW170817 and GW190521, together
with their proposed electromagnetic counterparts, to constrain cosmological
parameters and theories of gravity beyond General Relativity (GR). In
particular we consider models with a time-varying Planck mass, large
extra-dimensions, and a pheno... | [
{
"created": "Thu, 8 Oct 2020 15:14:19 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Dec 2020 17:45:17 GMT",
"version": "v2"
}
] | 2021-03-03 | [
[
"Mastrogiovanni",
"S.",
""
],
[
"Haegel",
"L.",
""
],
[
"Karathanasis",
"C.",
""
],
[
"Magana-Hernandez",
"I.",
""
],
[
"Steer",
"D. A.",
""
]
] | We use the gravitational wave (GW) events GW170817 and GW190521, together with their proposed electromagnetic counterparts, to constrain cosmological parameters and theories of gravity beyond General Relativity (GR). In particular we consider models with a time-varying Planck mass, large extra-dimensions, and a phenome... |
1804.03371 | Titus K Mathew | Rajagopalan Nair K and Titus K. Mathew | A model of the late universe with viscous Zel'ldovich fluid and decaying
vacuum | 17 pages, 8 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Many have speculated about the presence of a stiff fluid in very early stage
of the universe. Such a stiff fluid was first introduced by Zel'dovich.
Recently the late acceleration of the universe was studied by taking bulk
viscous stiff fluid as the dominant cosmic component, but the age predicted by
such a model is ... | [
{
"created": "Tue, 10 Apr 2018 07:04:05 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Apr 2018 16:09:16 GMT",
"version": "v2"
},
{
"created": "Wed, 25 Apr 2018 09:59:38 GMT",
"version": "v3"
},
{
"created": "Thu, 28 Jun 2018 08:08:51 GMT",
"version": "v4"
}
] | 2018-06-29 | [
[
"K",
"Rajagopalan Nair",
""
],
[
"Mathew",
"Titus K.",
""
]
] | Many have speculated about the presence of a stiff fluid in very early stage of the universe. Such a stiff fluid was first introduced by Zel'dovich. Recently the late acceleration of the universe was studied by taking bulk viscous stiff fluid as the dominant cosmic component, but the age predicted by such a model is le... |
1106.4695 | Luca Fabbri | Luca Fabbri | A Discussion on Dirac Field Theory, No-Go Theorems and Renormalizability | 10 pages | Int.J.Theor.Phys.52:634-643,2013 | 10.1007/s10773-012-1370-9 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study Dirac field equations coupled to electrodynamics with metric and
torsion fields: we discuss how special spinorial solutions are incompatible
with torsion; eventually these results will be used to sketch a discussion on
the problem of renormalizability of point-like particles.
| [
{
"created": "Thu, 23 Jun 2011 12:22:56 GMT",
"version": "v1"
},
{
"created": "Sun, 14 Oct 2012 12:42:30 GMT",
"version": "v2"
}
] | 2013-04-11 | [
[
"Fabbri",
"Luca",
""
]
] | We study Dirac field equations coupled to electrodynamics with metric and torsion fields: we discuss how special spinorial solutions are incompatible with torsion; eventually these results will be used to sketch a discussion on the problem of renormalizability of point-like particles. |
gr-qc/0603034 | James Van Meter | Charles W. Misner, James R. van Meter, David R. Fiske | Excising das All: Evolving Maxwell waves beyond scri | 13 pages; incorporated material from gr-qc/0512167 | Phys.Rev.D74:064003,2006 | 10.1103/PhysRevD.74.064003 | null | gr-qc | null | We study the numerical propagation of waves through future null infinity in a
conformally compactified spacetime. We introduce an artificial cosmological
constant, which allows us some control over the causal structure near null
infinity. We exploit this freedom to ensure that all light cones are tilted
outward in a ... | [
{
"created": "Fri, 10 Mar 2006 02:00:44 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Sep 2006 07:05:50 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Misner",
"Charles W.",
""
],
[
"van Meter",
"James R.",
""
],
[
"Fiske",
"David R.",
""
]
] | We study the numerical propagation of waves through future null infinity in a conformally compactified spacetime. We introduce an artificial cosmological constant, which allows us some control over the causal structure near null infinity. We exploit this freedom to ensure that all light cones are tilted outward in a re... |
gr-qc/0312123 | Sergio M. C. V. Goncalves | Sergio M. C. V. Goncalves | Shear-free gravitational collapse is strongly censored | 6 pages, revtex4; accepted for publication in Phys. Rev. D Rapid Comm | Phys.Rev.D69:021502,2004 | 10.1103/PhysRevD.69.021502 | null | gr-qc | null | We consider spherically symmetric spacetimes with matter whose timelike flow
is assumed to be shear-free. A number of results on the formation and
visibility of spacetime singularities is proven, with the main one being that
shear-free collapse cannot admit locally naked singularities (which implies
absence of global... | [
{
"created": "Tue, 30 Dec 2003 19:57:28 GMT",
"version": "v1"
}
] | 2010-05-12 | [
[
"Goncalves",
"Sergio M. C. V.",
""
]
] | We consider spherically symmetric spacetimes with matter whose timelike flow is assumed to be shear-free. A number of results on the formation and visibility of spacetime singularities is proven, with the main one being that shear-free collapse cannot admit locally naked singularities (which implies absence of globally... |
2003.00286 | Zack Carson | Zack Carson and Kent Yagi | Probing Einstein-dilaton Gauss-Bonnet Gravity with the inspiral and
ringdown of gravitational waves | 12 pages, 4 figures; added a citation and DOI | Phys. Rev. D 101, 104030 (2020) | 10.1103/PhysRevD.101.104030 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational waves from extreme gravity events such as the coalescence of
two black holes in a binary system fill our observable universe, bearing with
them the underlying theory of gravity driving their process. One compelling
alternative theory of gravity -- known as Einstein-dilaton Gauss-Bonnet gravity
motivated... | [
{
"created": "Sat, 29 Feb 2020 16:04:09 GMT",
"version": "v1"
},
{
"created": "Sat, 16 May 2020 02:55:12 GMT",
"version": "v2"
}
] | 2020-05-20 | [
[
"Carson",
"Zack",
""
],
[
"Yagi",
"Kent",
""
]
] | Gravitational waves from extreme gravity events such as the coalescence of two black holes in a binary system fill our observable universe, bearing with them the underlying theory of gravity driving their process. One compelling alternative theory of gravity -- known as Einstein-dilaton Gauss-Bonnet gravity motivated b... |
2004.12566 | Yan Peng | Yan Peng | Spontaneous scalarization of Gauss-Bonnet black holes surrounded by
massive scalar fields | 8 pages, 1 figure | null | 10.1016/j.physletb.2020.135569 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For massless scalar fields, a relation $\Delta_{n}=\frac{\sqrt{3}}{2}\pi$ for
$n\rightarrow \infty$ was observed in the scalar-Gauss-Bonnet theory. In the
present paper, we extend the discussion by including a nonzero scalar field
mass. For massive scalar fields, we show that the relation
$\Delta_{n}=\frac{\sqrt{3}}{... | [
{
"created": "Mon, 27 Apr 2020 03:24:22 GMT",
"version": "v1"
}
] | 2020-06-24 | [
[
"Peng",
"Yan",
""
]
] | For massless scalar fields, a relation $\Delta_{n}=\frac{\sqrt{3}}{2}\pi$ for $n\rightarrow \infty$ was observed in the scalar-Gauss-Bonnet theory. In the present paper, we extend the discussion by including a nonzero scalar field mass. For massive scalar fields, we show that the relation $\Delta_{n}=\frac{\sqrt{3}}{2}... |
2311.13157 | RunDong Tang | RunDong Tang, Wen-Biao Han, XingYu Zhong, Ye Jiang, Ping Shen, Yu Wang | Prospect of detecting magnetic fields from strong-magnetized binary
neutron stars | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Binary neutron star mergers are unique sources of gravitational waves in
multi-messenger astronomy. The inspiral phase of binary neutron stars can emit
gravitational waves as chirp signals. The present waveform models of
gravitational wave only considered the gravitational interaction. In this
paper, we derive the wa... | [
{
"created": "Wed, 22 Nov 2023 04:42:59 GMT",
"version": "v1"
}
] | 2023-11-23 | [
[
"Tang",
"RunDong",
""
],
[
"Han",
"Wen-Biao",
""
],
[
"Zhong",
"XingYu",
""
],
[
"Jiang",
"Ye",
""
],
[
"Shen",
"Ping",
""
],
[
"Wang",
"Yu",
""
]
] | Binary neutron star mergers are unique sources of gravitational waves in multi-messenger astronomy. The inspiral phase of binary neutron stars can emit gravitational waves as chirp signals. The present waveform models of gravitational wave only considered the gravitational interaction. In this paper, we derive the wave... |
2303.03796 | Holger Frits Bech Nielsen | Holger Bech Nielsen and Masao Ninomiya | A new view on cosmology, with non-translational invariant Hamiltonian | This article is a contribution to the 25th Workshop in Bled on "What
comes beyond the Standard Models'' organized by Normankoc Borstnik , Maxim
khlopov , Astri Kleppe and Holger Bech Nielsen | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The idea of this contribution is to suggest a way to get rid of gravity as a
dynamical space time approximately in cosmology and thus be able to use
Hamiltonian formulation ignoring the gravitational degrees of freedom, treating
them just as background. Concretely we suggest to use a background De Sitter
spacetime an... | [
{
"created": "Tue, 7 Mar 2023 11:01:56 GMT",
"version": "v1"
}
] | 2023-03-08 | [
[
"Nielsen",
"Holger Bech",
""
],
[
"Ninomiya",
"Masao",
""
]
] | The idea of this contribution is to suggest a way to get rid of gravity as a dynamical space time approximately in cosmology and thus be able to use Hamiltonian formulation ignoring the gravitational degrees of freedom, treating them just as background. Concretely we suggest to use a background De Sitter spacetime and ... |
gr-qc/0211057 | Tiberiu Harko | M. K. Mak, T. Harko | Quintessence and cosmic acceleration | 6 pages, 3 figures, to appear in Int. J. Mod. Phys. D | Int.J.Mod.Phys. D11 (2002) 1389-1397 | 10.1142/S0218271802002220 | null | gr-qc | null | A cosmological model with perfect fluid and self-interacting quintessence
field is considered in the framework of the spatially flat
Friedmann-Robertson-Walker (FRW) geometry. By assuming that all physical
quantities depend on the volume scale factor of the Universe, the general
solution of the gravitational field eq... | [
{
"created": "Fri, 15 Nov 2002 08:17:30 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Mak",
"M. K.",
""
],
[
"Harko",
"T.",
""
]
] | A cosmological model with perfect fluid and self-interacting quintessence field is considered in the framework of the spatially flat Friedmann-Robertson-Walker (FRW) geometry. By assuming that all physical quantities depend on the volume scale factor of the Universe, the general solution of the gravitational field equa... |
1710.02724 | David Wallace | David Wallace | The case for black hole thermodynamics, Part I: phenomenological
thermodynamics | 36 pages. Minor revisions only | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I give a fairly systematic and thorough presentation of the case for
regarding black holes as thermodynamic systems in the fullest sense, aimed at
students and non-specialists and not presuming advanced knowledge of quantum
gravity. I pay particular attention to (i) the availability in classical black
hole thermodyna... | [
{
"created": "Sat, 7 Oct 2017 19:17:10 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Jun 2018 00:10:22 GMT",
"version": "v2"
}
] | 2018-06-18 | [
[
"Wallace",
"David",
""
]
] | I give a fairly systematic and thorough presentation of the case for regarding black holes as thermodynamic systems in the fullest sense, aimed at students and non-specialists and not presuming advanced knowledge of quantum gravity. I pay particular attention to (i) the availability in classical black hole thermodynami... |
1304.7612 | George Lukes Gerakopoulos | Georgios Lukes-Gerakopoulos and George Contopoulos | Mind the Resonances: Final stages of accretion into bumpy black holes | 10 pages, 7 figures, To appear in the proceedings of the conference,
NEB 15 - Recent Developments in Gravity - 20-23 June 2012, Chania, Greece | null | 10.1088/1742-6596/453/1/012005 | null | gr-qc astro-ph.SR nlin.CD | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we discuss a possible way of testing the Kerr black hole
hypothesis by taking advantage of phenomena correlated with chaotic motion in
the final stages of an accretion disk around a bumpy black hole. We anticipate
that these phenomena should have an imprint in the electromagnetic spectrum
coming from ... | [
{
"created": "Mon, 29 Apr 2013 10:19:07 GMT",
"version": "v1"
}
] | 2013-08-26 | [
[
"Lukes-Gerakopoulos",
"Georgios",
""
],
[
"Contopoulos",
"George",
""
]
] | In this article we discuss a possible way of testing the Kerr black hole hypothesis by taking advantage of phenomena correlated with chaotic motion in the final stages of an accretion disk around a bumpy black hole. We anticipate that these phenomena should have an imprint in the electromagnetic spectrum coming from th... |
gr-qc/0210057 | Lluis Bel | Ll. Bel | A New Look to Massive Neutron Cores | 14 pages, Latex | null | null | null | gr-qc | null | We reconsider the problem of modelling static spherically symmetric perfect
fluid configurations with an equation of state from a point of view of that
requires the use of the concept of principal transform of a 3-dimensional
Riemannian metric. We discuss from this new point of view the meaning of those
familiar quan... | [
{
"created": "Thu, 17 Oct 2002 16:26:18 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bel",
"Ll.",
""
]
] | We reconsider the problem of modelling static spherically symmetric perfect fluid configurations with an equation of state from a point of view of that requires the use of the concept of principal transform of a 3-dimensional Riemannian metric. We discuss from this new point of view the meaning of those familiar quanti... |
gr-qc/0410147 | Martin Bojowald | Martin Bojowald and Rafal Swiderski | Spherically Symmetric Quantum Horizons | 4 pages, RevTeX4 | Phys.Rev.D71:081501,2005 | 10.1103/PhysRevD.71.081501 | AEI-2004-099 | gr-qc | null | Isolated horizon conditions specialized to spherical symmetry can be imposed
directly at the quantum level. This answers several questions concerning
horizon degrees of freedom, which are seen to be related to orientation, and
its fluctuations at the kinematical as well as dynamical level. In particular,
in the absen... | [
{
"created": "Fri, 29 Oct 2004 07:39:37 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Bojowald",
"Martin",
""
],
[
"Swiderski",
"Rafal",
""
]
] | Isolated horizon conditions specialized to spherical symmetry can be imposed directly at the quantum level. This answers several questions concerning horizon degrees of freedom, which are seen to be related to orientation, and its fluctuations at the kinematical as well as dynamical level. In particular, in the absence... |
2201.11352 | Tao Zhu | Chao Zhang, Tao Zhu, Xiongjun Fang, and Anzhong Wang | Imprints of dark matter on gravitational ringing of supermassive black
holes | 15 pages, 6 figures, 4 tables. arXiv admin note: substantial text
overlap with arXiv:2111.04966; version appeared in Physics of the Dark
Universe | Physics of the Dark Universe 37 (2022) 10107 | 10.1016/j.dark.2022.101078 | null | gr-qc astro-ph.HE | http://creativecommons.org/publicdomain/zero/1.0/ | Gravitational waves emitted from the gravitational ringing of supermassive
black holes are important targets to test general relativity and probe the
matter environment surrounding such black holes. The main components of the
ringing waveform are black hole quasi-normal modes. In this paper, we study the
effects of t... | [
{
"created": "Thu, 27 Jan 2022 07:17:28 GMT",
"version": "v1"
},
{
"created": "Sat, 2 Jul 2022 07:25:36 GMT",
"version": "v2"
}
] | 2022-07-05 | [
[
"Zhang",
"Chao",
""
],
[
"Zhu",
"Tao",
""
],
[
"Fang",
"Xiongjun",
""
],
[
"Wang",
"Anzhong",
""
]
] | Gravitational waves emitted from the gravitational ringing of supermassive black holes are important targets to test general relativity and probe the matter environment surrounding such black holes. The main components of the ringing waveform are black hole quasi-normal modes. In this paper, we study the effects of the... |
gr-qc/9907054 | Emulsion-Lab | S.Q. Wu and X. Cai | Maxwell-Boltzmann, Bose-Einstein, Fermi-Dirac statistical entropies in a
D-dimensional stationary axisymmetry space-time | 22 pages, no figure, in revtex (12pt), submitted to Phys. Rev. D | null | null | null | gr-qc | null | Statistical entropies of a general relativistic ideal gas obeying
Maxwell-Boltzmann, Bose-Einstein and Fermi-Dirac statistics are calculated in a
general axisymmetry space-time of arbitrary dimension. This general formation
can be used to discuss the entropy of a quantum field not only in the flat
space-time but also... | [
{
"created": "Fri, 16 Jul 1999 10:17:32 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wu",
"S. Q.",
""
],
[
"Cai",
"X.",
""
]
] | Statistical entropies of a general relativistic ideal gas obeying Maxwell-Boltzmann, Bose-Einstein and Fermi-Dirac statistics are calculated in a general axisymmetry space-time of arbitrary dimension. This general formation can be used to discuss the entropy of a quantum field not only in the flat space-time but also i... |
1408.2691 | Sean Gryb B | Sean Gryb, Karim Thebault | Time Remains | 30 pages, 1 figure. Version accepted for publication in the British
Journal for the Philosophy of Science | null | 10.1093/bjps/axv009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | On one popular view, the general covariance of gravity implies that change is
relational in a strong sense, such that all it is for a physical degree of
freedom to change is for it to vary with regard to a second physical degree of
freedom. At a quantum level, this view of "change as relative variation" leads
to a "f... | [
{
"created": "Tue, 12 Aug 2014 11:09:00 GMT",
"version": "v1"
}
] | 2018-01-18 | [
[
"Gryb",
"Sean",
""
],
[
"Thebault",
"Karim",
""
]
] | On one popular view, the general covariance of gravity implies that change is relational in a strong sense, such that all it is for a physical degree of freedom to change is for it to vary with regard to a second physical degree of freedom. At a quantum level, this view of "change as relative variation" leads to a "fun... |
1805.08825 | Timothy Walton | Robin W. Tucker and Timothy J. Walton | Chirality in Gravitational and Electromagnetic Interactions with Matter | 17 pages, 5 figures, Proceedings for 'Geometric Foundations of
Gravity', Tartu, 2017 | null | 10.1142/S0219887818400042 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been suggested that single and double jets observed emanating from
certain astrophysical objects may have a purely gravitational origin. We
discuss new classes of pulsed gravitational wave solutions to the equation for
perturbations of Ricci-flat spacetimes around Minkowski metrics, as models for
the genesis o... | [
{
"created": "Tue, 22 May 2018 19:32:09 GMT",
"version": "v1"
}
] | 2018-05-24 | [
[
"Tucker",
"Robin W.",
""
],
[
"Walton",
"Timothy J.",
""
]
] | It has been suggested that single and double jets observed emanating from certain astrophysical objects may have a purely gravitational origin. We discuss new classes of pulsed gravitational wave solutions to the equation for perturbations of Ricci-flat spacetimes around Minkowski metrics, as models for the genesis of ... |
2008.07963 | Elena Medina | Elena Medina and Luis Mart\'inez Alonso | Kinetic dominance and psi series in the Hamilton-Jacobi formulation of
inflaton models | 30 pages, 9 figures | Phys. Rev. D 102, 103517 (2020) | 10.1103/PhysRevD.102.103517 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Single-field inflaton models in the kinetic dominance period admit formal
solutions given by generalized asymptotic expansions called psi series. We
present a method for computing psi series for the Hubble parameter as a
function of the inflaton field in the Hamilton-Jacobi formulation of inflaton
models. Similar psi... | [
{
"created": "Tue, 18 Aug 2020 14:50:02 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Nov 2020 17:45:32 GMT",
"version": "v2"
}
] | 2020-11-18 | [
[
"Medina",
"Elena",
""
],
[
"Alonso",
"Luis Martínez",
""
]
] | Single-field inflaton models in the kinetic dominance period admit formal solutions given by generalized asymptotic expansions called psi series. We present a method for computing psi series for the Hubble parameter as a function of the inflaton field in the Hamilton-Jacobi formulation of inflaton models. Similar psi s... |
2109.12752 | Viqar Husain | Viqar Husain, Suprit Singh | Quantum backreaction on a classical universe | 7 pages, 2 figures | Phys. Rev. D 104, 124048 (2021) | 10.1103/PhysRevD.104.124048 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We study a first-order formulation for the coupled evolution of a quantum
scalar field and a classical Friedmann universe. The model is defined by a
state dependent hamiltonian constraint and the time dependent Schr\"odinger
equation for the scalar field. We solve the resulting non-linear equations
numerically for in... | [
{
"created": "Mon, 27 Sep 2021 01:30:34 GMT",
"version": "v1"
}
] | 2021-12-20 | [
[
"Husain",
"Viqar",
""
],
[
"Singh",
"Suprit",
""
]
] | We study a first-order formulation for the coupled evolution of a quantum scalar field and a classical Friedmann universe. The model is defined by a state dependent hamiltonian constraint and the time dependent Schr\"odinger equation for the scalar field. We solve the resulting non-linear equations numerically for init... |
1411.0325 | Zacharias Roupas | Zacharias Roupas | Corrigendum to "Thermodynamical instabilities of perfect fluid spheres
in General Relativity" | 4 pages | Class. Quantum Grav. 32 119501 (2015) | 10.1088/0264-9381/32/11/119501 | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In [1], the thermal equilibrium of static, spherically symmetric perfect
fluids in General Relativity was studied. I would like to elaborate three
points relevant to the results of [1]. The first point is only a clarification,
summarized in theorem 1 below, of results that appear in [1]. The following two
points corr... | [
{
"created": "Sun, 2 Nov 2014 21:45:27 GMT",
"version": "v1"
},
{
"created": "Mon, 11 May 2015 16:18:43 GMT",
"version": "v2"
}
] | 2015-05-12 | [
[
"Roupas",
"Zacharias",
""
]
] | In [1], the thermal equilibrium of static, spherically symmetric perfect fluids in General Relativity was studied. I would like to elaborate three points relevant to the results of [1]. The first point is only a clarification, summarized in theorem 1 below, of results that appear in [1]. The following two points correc... |
2302.01173 | Gabriele Barca | Gabriele Barca, Giovanni Montani, Alessandro Melchiorri | Emergent Universe Model from Modified Heisenberg Algebra | 12 pages, 6 figures. New upload to match published version | Phys. Rev. D 108, 063505 (2023) | 10.1103/PhysRevD.108.063505 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide an Emergent Universe picture in which the fine-tuning on the
initial conditions is replaced by cut-off physics, implemented on a
semiclassical level when referred to the Universe dynamics and on a purely
quantum level for the quantum fluctuations of the inflaton field. The adopted
cut-off physics is inspir... | [
{
"created": "Thu, 2 Feb 2023 15:50:14 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Sep 2023 10:51:18 GMT",
"version": "v2"
}
] | 2023-09-11 | [
[
"Barca",
"Gabriele",
""
],
[
"Montani",
"Giovanni",
""
],
[
"Melchiorri",
"Alessandro",
""
]
] | We provide an Emergent Universe picture in which the fine-tuning on the initial conditions is replaced by cut-off physics, implemented on a semiclassical level when referred to the Universe dynamics and on a purely quantum level for the quantum fluctuations of the inflaton field. The adopted cut-off physics is inspired... |
1308.6587 | Vitor Cardoso | Vitor Cardoso, Isabella P. Carucci, Paolo Pani, Thomas P. Sotiriou | Black holes with surrounding matter in scalar-tensor theories | 5 pages. Published version. arXiv admin note: substantial text
overlap with arXiv:1305.6936 | Phys.Rev.Lett. 111, 111101 (2013) | 10.1103/PhysRevLett.111.111101 | null | gr-qc astro-ph.HE hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We uncover two mechanisms that can render Kerr black holes unstable in
scalar-tensor gravity, both associated to the presence of matter in the
vicinity of the black hole and the fact that this introduces an effective mass
for the scalar. Our results highlight the importance of understanding the
structure of spacetime... | [
{
"created": "Thu, 29 Aug 2013 20:00:23 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Oct 2013 10:24:08 GMT",
"version": "v2"
}
] | 2015-06-17 | [
[
"Cardoso",
"Vitor",
""
],
[
"Carucci",
"Isabella P.",
""
],
[
"Pani",
"Paolo",
""
],
[
"Sotiriou",
"Thomas P.",
""
]
] | We uncover two mechanisms that can render Kerr black holes unstable in scalar-tensor gravity, both associated to the presence of matter in the vicinity of the black hole and the fact that this introduces an effective mass for the scalar. Our results highlight the importance of understanding the structure of spacetime i... |
1111.6248 | Jose Luis Jaramillo | Mar\'ia E. Gabach Cl\'ement, Jos\'e Luis Jaramillo | Black hole Area-Angular momentum-Charge inequality in dynamical
non-vacuum spacetimes | 4 pages, no figures | null | 10.1103/PhysRevD.86.064021 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the area-angular momentum-charge inequality (A/(4\pi))^2 \geq
(2J)^2 + (Q_E^2 + Q_M^2)^2 holds for apparent horizons of electrically and
magnetically charged rotating black holes in generic dynamical and non-vacuum
spacetimes. More specifically, this quasi-local inequality applies to axially
symmetric cl... | [
{
"created": "Sun, 27 Nov 2011 11:28:53 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Clément",
"María E. Gabach",
""
],
[
"Jaramillo",
"José Luis",
""
]
] | We show that the area-angular momentum-charge inequality (A/(4\pi))^2 \geq (2J)^2 + (Q_E^2 + Q_M^2)^2 holds for apparent horizons of electrically and magnetically charged rotating black holes in generic dynamical and non-vacuum spacetimes. More specifically, this quasi-local inequality applies to axially symmetric clos... |
2004.09651 | Igor Khavkine | Igor Khavkine | Explicit Triangular Decoupling of the Separated Lichnerowicz Tensor Wave
Equation on Schwarzschild into Scalar Regge-Wheeler Equations | v2: 57 pages, presentation rearranged and remarks added for clarity;
published version | SIGMA 18 (2022), 011, 57 pages | 10.3842/SIGMA.2022.011 | null | gr-qc math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | We consider the vector and the Lichnerowicz wave equations on the
Schwarzschild spacetime, which correspond to the Maxwell and linearized
Einstein equations in harmonic gauges (or, respectively, in Lorenz and de
Donder gauges). After a complete separation of variables, the radial mode
equations form complicated syste... | [
{
"created": "Mon, 20 Apr 2020 21:41:22 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Feb 2022 12:47:46 GMT",
"version": "v2"
}
] | 2022-02-07 | [
[
"Khavkine",
"Igor",
""
]
] | We consider the vector and the Lichnerowicz wave equations on the Schwarzschild spacetime, which correspond to the Maxwell and linearized Einstein equations in harmonic gauges (or, respectively, in Lorenz and de Donder gauges). After a complete separation of variables, the radial mode equations form complicated systems... |
2107.07679 | Giovanni Otalora | Mat\'ias L\'opez, Giovanni Otalora, Nelson Videla | Chaotic Inflation and Reheating in Generalized Scalar-Tensor Gravity | 26 pages, 8 figures, 2 tables. Accepted version for publication in
JCAP | JCAP10(2021)021 | 10.1088/1475-7516/2021/10/021 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present work, we study slow-roll inflation in scalar-tensor gravity
theories in the presence of both the non-minimal coupling between the scalar
field and curvature, and the Galileon self-interaction of the scalar field.
Furthermore, we give predictions for the duration of reheating as well as for
the reheatin... | [
{
"created": "Fri, 16 Jul 2021 02:55:00 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Sep 2021 18:38:29 GMT",
"version": "v2"
}
] | 2021-11-11 | [
[
"López",
"Matías",
""
],
[
"Otalora",
"Giovanni",
""
],
[
"Videla",
"Nelson",
""
]
] | In the present work, we study slow-roll inflation in scalar-tensor gravity theories in the presence of both the non-minimal coupling between the scalar field and curvature, and the Galileon self-interaction of the scalar field. Furthermore, we give predictions for the duration of reheating as well as for the reheating ... |
gr-qc/0006067 | Alejandro Corichi | A. Corichi and J.M. Reyes | A Gaussian Weave for Kinematical Loop Quantum Gravity | 15 pages, 3 figures, Revtex file. Comments added and references
updated. Final version to appear in IJMP-D | Int.J.Mod.Phys. D10 (2001) 325-338 | 10.1142/S0218271801000846 | ICN-UNAM-00/09 | gr-qc hep-th | null | Remarkable efforts in the study of the semi-classical regime of kinematical
loop quantum gravity are currently underway. In this note, we construct a
``quasi-coherent'' weave state using Gaussian factors. In a similar fashion to
some other proposals, this state is peaked in both the connection and the spin
network ba... | [
{
"created": "Tue, 20 Jun 2000 01:28:32 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Aug 2000 14:48:36 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Corichi",
"A.",
""
],
[
"Reyes",
"J. M.",
""
]
] | Remarkable efforts in the study of the semi-classical regime of kinematical loop quantum gravity are currently underway. In this note, we construct a ``quasi-coherent'' weave state using Gaussian factors. In a similar fashion to some other proposals, this state is peaked in both the connection and the spin network basi... |
gr-qc/9710081 | M. Rainer | M. Rainer | The role of dilations in diffeomorphism covariant algebraic quantum
field theory | 11 pages, LaTeX, typos corrected | Int.J.Theor.Phys.39:259-275,2000 | 10.1023/A:1003676023771 | Uni-P-Math/15-10-97 | gr-qc | null | The quantum analogue of general relativistic geometry should be implementable
on smooth manifolds without an a priori metric structure, the kinematical
covariance group acting by diffeomorphisms.
Here I approach quantum gravity (QG) in the view of constructive, algebraic
quantum field theory (QFT). Comparing QG wit... | [
{
"created": "Wed, 15 Oct 1997 21:46:16 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Nov 1997 11:46:44 GMT",
"version": "v2"
},
{
"created": "Fri, 2 Apr 1999 06:14:04 GMT",
"version": "v3"
}
] | 2011-04-20 | [
[
"Rainer",
"M.",
""
]
] | The quantum analogue of general relativistic geometry should be implementable on smooth manifolds without an a priori metric structure, the kinematical covariance group acting by diffeomorphisms. Here I approach quantum gravity (QG) in the view of constructive, algebraic quantum field theory (QFT). Comparing QG with us... |
1506.07759 | Giuseppe Sellaroli | Florian Girelli, Giuseppe Sellaroli | 3d Lorentzian loop quantum gravity and the spinor approach | Fixed typos. 28 pages, 3 figures. To appear in Phys. Rev. D | Phys. Rev. D 92, 124035 (2015) | 10.1103/PhysRevD.92.124035 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the generalization of the "spinor approach" to the Lorentzian
case, in the context of 3d loop quantum gravity with cosmological constant
$\Lambda=0$. The key technical tool that allows this generalization is the
recoupling theory between unitary infinite-dimensional representations and
non-unitary finite-... | [
{
"created": "Thu, 25 Jun 2015 14:07:42 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Nov 2015 21:44:07 GMT",
"version": "v2"
}
] | 2015-12-23 | [
[
"Girelli",
"Florian",
""
],
[
"Sellaroli",
"Giuseppe",
""
]
] | We consider the generalization of the "spinor approach" to the Lorentzian case, in the context of 3d loop quantum gravity with cosmological constant $\Lambda=0$. The key technical tool that allows this generalization is the recoupling theory between unitary infinite-dimensional representations and non-unitary finite-di... |
gr-qc/0501031 | Carsten Gundlach | David Garfinkle and Carsten Gundlach | Well-posedness of the scale-invariant tetrad formulation of the vacuum
Einstein equations | Added section on the well-posedness of the constraint evolution
system | Class.Quant.Grav. 22 (2005) 2679-2686 | 10.1088/0264-9381/22/13/011 | null | gr-qc | null | We show that with a small modification, the formulation of the Einstein
equations of Uggla et al, which uses tetrad variables normalised by the
expansion, is a mixed symmetric hyperbolic/parabolic system. Well-posedness of
the Cauchy problem follows from a standard theorem.
| [
{
"created": "Mon, 10 Jan 2005 14:17:55 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Jun 2005 17:34:52 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Garfinkle",
"David",
""
],
[
"Gundlach",
"Carsten",
""
]
] | We show that with a small modification, the formulation of the Einstein equations of Uggla et al, which uses tetrad variables normalised by the expansion, is a mixed symmetric hyperbolic/parabolic system. Well-posedness of the Cauchy problem follows from a standard theorem. |
2407.04735 | S. Davood Sadatian | S. Davood Sadatian, Amir Sabouri, Zahra Davari | Loop Quantum Gravity and CMB Anisotropy | 15 pages, 3 figures | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Recent satellite observations have revealed significant anisotropy in the
cosmic microwave background (CMB) radiation, a phenomenon that had previously
been detected but received limited attention due to its subtlety. With the
advent of more precise measurements from satellites, the extent of this
anisotropy has beco... | [
{
"created": "Mon, 1 Jul 2024 10:34:49 GMT",
"version": "v1"
}
] | 2024-07-09 | [
[
"Sadatian",
"S. Davood",
""
],
[
"Sabouri",
"Amir",
""
],
[
"Davari",
"Zahra",
""
]
] | Recent satellite observations have revealed significant anisotropy in the cosmic microwave background (CMB) radiation, a phenomenon that had previously been detected but received limited attention due to its subtlety. With the advent of more precise measurements from satellites, the extent of this anisotropy has become... |
gr-qc/9607055 | Jack Gegenberg | J. Gegenberg, G. Kunstatter, and T. Strobl | Statistical Mechanical Entropy of Two-Dimensional Black Holes | Important acknowledgments added; typos corrected. Uses sprocl.sty | null | null | null | gr-qc hep-th | null | We calculate the statistical mechanical entropy associated with boundary
terms in the two-dimensional Euclidean black holes in deSitter gravity.
| [
{
"created": "Tue, 23 Jul 1996 15:58:58 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Mar 1997 14:36:43 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Gegenberg",
"J.",
""
],
[
"Kunstatter",
"G.",
""
],
[
"Strobl",
"T.",
""
]
] | We calculate the statistical mechanical entropy associated with boundary terms in the two-dimensional Euclidean black holes in deSitter gravity. |
2209.04783 | Marko Vojinovic | Nikola Paunkovic and Marko Vojinovic | Operational verification of the existence of a spacetime manifold | v2: various text improvements, several typos fixed. 14+4 pages, 7
figures | null | null | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We argue that there exists an operational way to establish the objective
reality of the notions of space and time. Specifically, we propose a
theory-independent protocol for a gedanken-experiment, whose outcome is a
signal establishing the observability of the spacetime manifold, without a
priori assuming its existen... | [
{
"created": "Sun, 11 Sep 2022 04:29:25 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Feb 2024 17:17:41 GMT",
"version": "v2"
}
] | 2024-02-12 | [
[
"Paunkovic",
"Nikola",
""
],
[
"Vojinovic",
"Marko",
""
]
] | We argue that there exists an operational way to establish the objective reality of the notions of space and time. Specifically, we propose a theory-independent protocol for a gedanken-experiment, whose outcome is a signal establishing the observability of the spacetime manifold, without a priori assuming its existence... |
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